Division of Epidemiology, Biostatistics, and Environmental Health, University of Memphis, Memphis, 38152, TN, USA.|Division of Epidemiology, Biostatistics, and Environmental Health, University of Memphis, Memphis, 38152, TN, USA. hzhang6@memphis.edu.|Division of Epidemiology, Biostatistics, and Environmental Health, University of Memphis, Memphis, 38152, TN, USA.|Division of Epidemiology, Biostatistics, and Environmental Health, University of Memphis, Memphis, 38152, TN, USA.|Winship Cancer Institute, Emory University, 1365 Clifton Rd. NE, Atlanta, 30322, GA, USA.|Winship Cancer Institute, Emory University, 1365 Clifton Rd. NE, Atlanta, 30322, GA, USA.|National Institute of Environmental Health Sciences, National Health Research Institutes, Miaoli, Taiwan. slwang@nhri.org.tw.