[1] Univ Puerto Rico, Sch Med, San Juan, PR 00936 USA
[2] Univ Puerto Rico, San Juan, PR 00936 USA
[3] Auxilio Mutuo Canc Ctr, San Juan, PR USA
[4] Univ Puerto Rico, Sch Med, Univ Dist Hosp, San Juan, PR 00936 USA
[5] Univ Puerto Rico, Puerto Rico Cent Canc Registry, Ctr Comprehens Canc, San Juan, PR 00936 USA