[1] Univ Puerto Rico, Div Canc Control & Populat Sci, Comprehens Canc Ctr, POB 363027, San Juan, PR 00925 USA
[2] Univ Puerto Rico, Comprehens Canc Ctr, Puerto Rico Cent Canc Registry, San Juan, PR USA
[3] Univ Puerto Rico, Grad Sch Publ Hlth, Dept Hlth Serv Adm, Med Sci Campus, San Juan, PR USA
[4] Univ Massachusetts, Dept Populat & Quantitat Hlth Sci, Chan Med Sch, Worcester, MA USA
[5] Auxilio Mutuo Hosp, San Juan, PR USA