[1] Univ Minnesota, Sch Publ Hlth, Div Epidemiol, Minneapolis, MN 55454 USA
[2] Univ N Carolina, Sch Publ Hlth, Dept Nutr & Epidemiol, Chapel Hill, NC USA
[3] NIH, Bethesda, MD 20892 USA
[4] Univ Alabama Birmingham, Dept Behav Med, Birmingham, AL USA
[5] Univ N Carolina, Sch Publ Hlth, Dept Epidemiol, Chapel Hill, NC USA
[6] Johns Hopkins Univ, Sch Hyg & Publ Hlth, Dept Int Hlth, Baltimore, MD USA
[7] Univ Arizona, Tucson, AZ USA
[8] Univ New Mexico, Dept Pediat, Albuquerque, NM 87131 USA
[9] Univ Memphis, Dept Psychol, Memphis, TN 38152 USA