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Your Environment. Your Health.

Richard Kwok, Ph.D.

Chronic Disease Epidemiology Group

Richard Kwok, Ph.D.
Richard Kwok, Ph.D.
Staff Scientist
Tel 919-627-8892
Fax 301-480-3290
richard.kwok@nih.gov
P.O. Box 12233
Mail Drop A3-05
Durham, N.C. 27709

Research Summary

Richard Kwok, Ph.D. is a staff scientist in the Epidemiology Branch at NIEHS and is the Lead Associate Investigator for the GuLF STUDY . The study focuses on the potential health effects of clean-up workers, volunteers, and community members from the Deepwater Horizon disaster. Kwok specializes in the environmental causes of a range of diseases, and the pervasive nature of the environment in disease etiology has allowed him to work on a number of different projects with domestic and international collaborators from federal, academic, and industry sectors. His work has included research into air and water pollution, including arsenic, and non-ionizing UV radiation exposures with outcomes including cardiovascular, respiratory, reproductive and cancer health outcomes. Kwok received his B.S.P.H. in environmental science, and his M.S.P.H. and Ph.D. in epidemiology from the University of North Carolina at Chapel Hill.

Studies

  • The GuLF STUDY

    The Gulf Long Term Follow-Up Study (GuLF STUDY) was developed to learn about possible health effects of the recent Deepwater Horizon oil spill in the Gulf of Mexico.

Selected Publications

  1. McGowan CJ, Kwok RK, Engel LS, Stenzel MR, Stewart PA, Sandler DP. (in press) Respiratory, dermal, and eye irritation symptoms associated with Corexit EC9527A/EC9500A following the Deepwater Horizon oil spill: Findings from the GuLF STUDY. Environmental Health Perspectives. 
  2. Sandifer PA, Knapp LC, Collier TK, Jones AL, Juster RP, Kelble CR, Kwok RK, Miglarese JV, Palinkas LA, Porter DE, Scott GI, Smith LM, Sullivan WC, Sutton-Grier AE. (2017). A Conceptual Model to Assess Stress-Associated Health Effects of Multiple Ecosystem Services Degraded by Disaster Events in the Gulf of Mexico and Elsewhere. GeoHealth. 
  3. Doherty BT, Kwok RK, Curry MD, Ekenga C, Chambers D, Sandler DP, Engel LS. (2017) Associations between Blood BTEXS Concentrations and Hematologic Parameters among Adult Residents of the U.S. Gulf States. Environmental Research. 156:579-587. doi: 10.1016/j.envres.2017.03.048. 
  4. Engel LS, Kwok RK, Miller AK, Blair A, Curry MD, McGrath JA, Sandler DP, GuLF STUDY Research Team. (2017) The Gulf Long-Term Follow-Up Study (GuLF STUDY): Biospecimen Collection at Enrollment. Journal of Toxicology and Environmental Health, Part A. 80(4):218-229. doi: 10.1080/15287394.2017.1283274 
  5. Stingone JA, Buck Louis GM, Nakayama SF, Vermeulen RCH, Kwok RK, Cui Y, Balshaw DM, Teitelbaum SL. (2017) Toward greater implementation of the exposome research paradigm within environmental epidemiology. Annual Review of Public Health. 38: 315-327. doi: 10.1146/annurev-publhealth-082516-012750 
  6. Kwok RK, Engel LS, Miller AK, Blair A, Curry MD, Jackson II WB, Stewart PA, Stenzel MR, Birnbaum LS, Sandler DP, GuLF STUDY Research Team. (2017) The GuLF STUDY: a prospective study of persons involved in the Deepwater Horizon oil spill response and clean-up. Environmental Health Perspectives. 125:570-578. doi: 10.1289/EHP715
  7. Groth C, Banerjee S, Ramachandran G, Stenzel MR, Sandler DP, Blair A, Engel LS, Kwok RK, Stewart PA. (2017) Bivariate Left-Censored Bayesian Model for Predicting Exposure: Preliminary Analysis of Worker Exposure during the Deepwater Horizon Oil Spill. Annals of Work Exposures and Health. 61(1): 76-86. doi: 10.1093/annweh/wxw003
  8. Lichtveld M, Sherchan S, Gam K, Kwok R, Mundorf C, Shankar A, Soares L. (2016) The Deepwater Horizon Oil Spill through the Lens of Human Health and the Ecosystem. Current Environmental Health Reports. doi : 10.1007/s40572-016-0119-7
  9. Lowe SR, Kwok RK, Payne J, Engel LS, Galea S, Sandler DP. (2016) Why Does Disaster Recovery Work Influence Mental Health?: Pathways through Physical Health and Income. American journal of community psychology. 58(3-4):354-364.  [Abstract]
  10. Cui Y, Balshaw DM, Kwok RK, Thompson CL, Collman GW, Birnbaum LS. (2016) The Exposome: Embracing the Complexity for Discovery in Environmental Health. Environmental Health Perspectives. 124(8):A137-40. doi: 10.1289/EHP412. PMID: 27479988
  11. Miller A, Yeskey K, Garantziotis S, Arnesen S, Bennett A, O'Fallon L, Thompson C, Reinlib L, Masten S, Remington J, Love C, Ramsey S, Rosselli R, Galluzzo B, Lee J, Kwok R, Hughes J. (2016) Integrating Health Research into Disaster Response: The New NIH Disaster Research Response Program. International Journal of Environmental Research and Public Health. 13(7). pii: E676. doi: 10.3390/ijerph13070676. PMID: 27384574
  12. Huynh T, Quick H, Ramachandran G, Banerjee S, Stenzel M, Sandler DP, Engel LS, Kwok RK, Blair A, Stewart PA. (2016) A Comparison of the β-substitution Method and a Bayesian Method for Analyzing Left-Censored Data. Annals of Occupational Hygiene. 60(1):56-73. doi:10.1093/annhyg/mev049. PMID: 26209598
  13. Resnik DB, Miller AK, Kwok R, Engel LS, Sandler DP. Erratum: "Ethical Issues in Environmental Health Research Related to Public Health Emergencies: Reflections on the GuLF STUDY". Environmental health perspectives 2016 124(2):A29-. [Abstract]
  14. Lowe SR, Kwok RK, Payne J, Engel LS, Galea S, Sandler DP. (2015) Mental health service use by cleanup workers in the aftermath of the Deepwater Horizon oil spill. Soc Sci Med. 130:125-34. doi: 10.1016/j.socscimed.2015.02.009. PMID: 25697635; PMCID: PMC4363993.
  15. Huynh T, Ramachandran G, Banerjee S, Monteiro J, Stenzel M, Sandler D, Kwok RK, Engel L, Blair A, Stewart PA. (2014) Comparison of methods for analyzing left-censored occupational exposure data. Annals of Occupational Hygiene. doi: 10.1093/annhyg/meu067. PMID: 25261453. PMCID: PMC4271092.
  16. Quick H, Groth C, Banerjee S, Carlin BP, Stenzel MR, Stewart PA, Sandler DP, Engel LS, Kwok RK. Exploration of the use of Bayesian modeling of gradients for censored spatiotemporal data from the Deepwater Horizon oil spill. Spatial statistics 2014 9():166-179. [Abstract]
  17. Cahoon EK, Wheeler DC, Kimlin MG, Kwok RK, Alexander BH, Little MP, Linet MS, Freedman DM. (2013). Individual, environmental, and meteorological predictors of daily personal ultraviolet radiation exposure measurements in a United States cohort study. PLoS ONE. 8(2):e54983. doi: 10.1371/journal.pone.0054983. PMID: 23405102. PMCID: PMC3566166. [Abstract]
  18. Balshaw DM, Kwok RK. (2012) Innovative methods for improving measures of the personal environment. American journal of preventive medicine 42(5):558-9. [Abstract]
  19. Hamilton, C.M., Strader, L.C., Pratt, J.G., Maiese, D., Hendershot, T., Kwok, R.K., Hammond, J.A., Huggins, W., Jackman, D., Pan, H., Nettles, D.S., Beaty, T.H., Farrer, L.A., Kraft, P., Marazita, M.L., Ordovas, J.M., Pato, C.N., Spitz, M.R., Wagener, D., Williams, M., Junkins, H.A., Harlan, W.R., Ramos, E.M., Haines, J. (2011). The PhenX Toolkit: Get the Most From Your MeasuresThe PhenX Toolkit: Get the Most From Your Measures. American Journal of Epidemiology, 174(3):253-60 [Abstract]
  20. Hamilton, C.M., Strader, L.C., Pratt, J.G., Maiese, D., Hendershot, T., Kwok, R.K., Hammond, J.A., Huggins, W., Jackman, D., Pan, H., Nettles, D.S., Beaty, T.H., Farrer, L.A., Kraft, P., Marazita, M.L., Ordovas, J.M., Pato, C.N., Spitz, M.R., Wagener, D., Williams, M., Junkins, H.A., Harlan, W.R., Ramos, E.M., Haines, J. (2011). Response to Invited Commentary: Hamilton et al. Respond to "Consolidating Data Harmonization." American Journal of Epidemiology, 174(3):265-6.
  21. Myers, S. L., Lobdell, D. T., Liu, Z., Xia, Y., Ning, Z., Kwok, R. K., Mumford, J. L., & Mendola, P. (2010) Maternal drinking water arsenic exposure and perinatal outcomes in Inner Mongolia, China. Journal of Epidemiology and Community Health, 64(4), 325-9. [Abstract]
  22. Yu, C. L., Li, Y., Freedman, D. M., Fears, T., Kwok, R. K., Chodick, G., Alexander, B. H., Kimlin, M., Kricker, A., Armstrong, B. K., & Linet, M. S. (2009). Assessment of lifetime cumulative sun exposure using a self-administered questionnaire: Reliability of two approaches. Cancer Epidemiology, Biomarkers & Prevention, 18(2), 464-471. [Abstract]
  23. Kwok, R. K., Linet, M. S., Chodick, G., Kleinerman, R. A., Freedman, D. M., Fears, T., Johnson, R. E., & Alexander, B. H. (2009). Simplified categorization of outdoor activities for male and female U.S. indoor workers; application to ultraviolet radiation assessment questionnaires. Photochemistry and Photobiology, 85(1), 45-49.  [Abstract]
  24. Chodick, G., Kleinerman, R. A., Linet, M. S., Fears, T., Kwok, R. K., Kimlin, M. G., Alexander, B. H., & Freedman, D. M. (2008). Agreement between diary records of time spent outdoors and personal ultraviolet radiation measurements. Photochemistry and Photobiology, 84(3), 713–718. [Abstract]
  25. Chodick, G., Freedman, D. M., Kwok, R. K., Fears, T., Linet, M. S., Alexander, B. H., & Kleinerman, R. A. (2007). Agreement between contemporaneously recorded and subsequently recalled time spent outdoors: Implications for environmental exposure studies. Annals of Epidemiology, 17(2), 106–111. [Abstract]
  26. Kwok, R. K. (2007). A review and rationale for studying the cardiovascular effects of drinking water arsenic in women of reproductive age. Toxicology and Applied Pharmacology, 222(3), 344–350. [Abstract]
  27. Kwok, R. K., Mendola, P., Liu, Z. Y., Savitz, D. A., Heiss, G., He, L. L., Xia, Y., Lobdell, D., Zeng, D., Thorp, J. M., Jr., Creason, J. P., & Mumford, J. L. (2007). Drinking water arsenic exposure and blood pressure in healthy women of reproductive age in inner Mongolia, China. Toxicology and Applied Pharmacology, 222(3), 337–343. [Abstract]
  28. Liu, Z. Y., Lobdell, D. T., Myers, S. L., He, L. L., Yang, M., Kwok, R. K., Mumford, J. L., & Mendola, P. (2007). Pregnancy and perinatal health, inner Mongolia, China, 1996–1999. International Journal of Gynecology and Obstetrics, 99(2), 127–131. [Abstract]
  29. Mumford, J., Wu, K., Xia, Y., Kwok, R. K., Yang, Z., Foster, J., & Sanders, W. E., Jr. (2007). Chronic arsenic exposure and cardiac repolarization abnormalities with qt interval prolongation in a population-based study. Environmental Health Perspectives, 115(5), 690–694 [Abstract]
  30. Ning, Z., Lobdell, D. T., Kwok, R. K., Liu, Z., Zhang, S., Ma, C., Riediker, M., & Mumford, J. L. (2007). Residential exposure to drinking water arsenic in inner Mongolia, China. Toxicology and Applied Pharmacology, 222(3), 351–356. [Abstract]
  31. Kwok, R. K., Kaufmann, R. B., & Jakariya, M. (2006). Arsenic in drinking water and reproductive health outcomes: A study of Bangladesh integrated nutrition programm participants. Journal of Health, Population and Nutrition, 24(2), 190–205. [Abstract]
  32. Li, Y. H., Xia, Y. J., He, L. J., Ning, Z. X., Wu, K. G., Zhao, B. X., Le, X. C., Kwok, R. K., Schmitt, M., Wade, T., Mumford, J., & Otto, D. (2006). Neurotoxic effects of chronic exposure to arsenic via drinking water in inner Mongolia: I. symptoms and pinprick testing. Journal of Water and Health, 4(1), 29–37 [Abstract]
  33. Otto, D., Li, Y. H., Xia, Y. J., He, L. L., Ning, Z. X., Wu, K. G., Zhao, B. X., Hudnell, H. K., Kwok, R. K., Geller, A., Wade, T., & Mumford, J. (2006). Health effects of chronic exposure to arsenic via drinking water in inner Mongolia: II. vibrotactile and visual function. Journal of Water and Health, 4(1), 39–48. [Abstract]
  34. Feng, Z., Xia, Y., Tian, D., Wu, K., Schmitt, M., Kwok, R. K., & Mumford, J. L. (2001). DNA damage in buccal epithelial cells from individuals chronically exposed to arsenic via drinking water in inner Mongolia, China. Anticancer Research, 21(1A), 51–57. [Abstract]
  35. Kwok, R. K., & Yankaskas, B. C. (2001). The use of census data for determining race and education as SES indicators: A validation study. Annals of Epidemiology, 11(3), 171–177. [Abstract]
  36. Heinzen, M. T., Yankaskas, B. C., & Kwok, R. K. (2000). Comparison of woman-specific versus breast-specific data for reporting screening mammography performance. Academic Radiology, 7(4), 232–236. [Abstract]
  37. Howard-Reed, C., Rea, A. W., Zufall, M. J., Burke, J. M., Williams, R. W., Suggs, J. C., Sheldon, L. S., Walsh, D., & Kwok, R. (2000). Use of a continuous nephelometer to measure personal exposure to particles during the U.S. environmental protection agency Baltimore and Fresno panel studies. Journal of the Air and Waste Management Association, 50(7), 1125–1132. [Abstract]
  38. Williams, R., Suggs, J., Zweidinger, R., Evans, G., Creason, J., Kwok, R., Rodes, C., Lawless, P., & Sheldon, L. (2000). The 1998 Baltimore particulate matter epidemiology-exposure study: Part 1. Comparison of ambient, residential outdoor, indoor, and apartment particulate matter monitoring. Journal of Exposure Analysis and Environmental Epidemiology, 10(6), Pt. 1, 518–532. [Abstract]
  39. Williams, R., Suggs, J., Creason, J., Rodes, C., Lawless, P., Kwok, R., Zweidinger, R., & Sheldon, L. (2000). The 1998 Baltimore particulate matter epidemiology-exposure study: Part 2. Personal exposure assessment associated with an elderly study population. Journal of Exposure Analysis and Environmental Epidemiology, 10(6), 533–543. [Abstract]
  40. Williams, R., Suggs, J., Rodes, C., Lawless, P., Zweidinger, R., Kwok, R., Creason, J., & Sheldon, L. (2000). Comparison of PM2.5 and pm10 monitors. Journal of Exposure Analysis and Environmental Epidemiology, 10(5), 497–505. [Abstract]
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