[1] Univ N Carolina, Dept Nutr, Chapel Hill, NC 27599 USA
[2] W Virginia Univ, Robert C Byrd Hlth Sci Ctr, Community Hlth Promot Program, Dept Community Med, Morgantown, WV 26506 USA
[3] Univ N Carolina, Dept Hlth Behav & Hlth Educ, Chapel Hill, NC 27599 USA
[4] Univ N Carolina, Ctr Hlth Promot & Dis Prevent, Chapel Hill, NC 27599 USA
[5] Univ N Carolina, Ctr Dev & Learning, Chapel Hill, NC 27599 USA
[6] Univ N Carolina, Dept Biostat, Chapel Hill, NC 27599 USA
[7] Univ Valparaiso, Dept Stat, Valparaiso, Chile