[1] Univ Philippines Manila, Coll Nursing, Manila, Philippines
[2] Univ Philippines Manila, Dept Pediat, Coll Med, Manila, Philippines
[3] Univ Iowa, Coll Nursing, Iowa City, IA 52242 USA
[4] Univ Philippines Manila, Inst Human Genet, NIH, Manila, Philippines
[5] Univ Washington, Inst Publ Hlth Genet, Seattle, WA 98195 USA