[1] Univ Pittsburgh, Dept Biostat, Pittsburgh, PA 15260 USA
[2] Univ Pittsburgh, Dept Human Genet, Pittsburgh, PA 15260 USA
[3] Yale Sch Publ Hlth, Dept Chron Dis Epidemiol, New Haven, CT USA
[4] Univ Cincinnati, Dept Environm & Publ Hlth Sci, Cincinnati, OH 45221 USA
[5] Govt Samoa, Minist Hlth, Apia, Samoa
[6] Lutia Puava & Mapu Fagalele, Apia, Samoa
[7] Brown Univ, Int Hlth Inst, Providence, RI 02912 USA
[8] Brown Univ, Dept Epidemiol, Providence, RI 02912 USA
[9] Brown Univ, Dept Anthropol, Providence, RI 02912 USA