[1] Univ Puerto Rico, Comprehens Canc Ctr, POB 363027, San Juan, PR 00936 USA
[2] Univ Puerto Rico, Grad Sch Publ Hlth, Med Sci Campus, San Juan, PR 00936 USA
[3] Univ Puerto Rico, Comprehens Canc Ctr, Puerto Rico Cent Canc Registry, Canc Control & Populat Sci Div, San Juan, PR 00936 USA
[4] Med Univ South Carolina, Dept Publ Hlth Sci, Charleston, SC USA
[5] Med Univ South Carolina, Hollings Canc Ctr, Charleston, SC USA