1. University of Puerto Rico Comprehensive Cancer Center, San Juan, Puerto Rico.
2. Graduate School of Public Health, Medical Sciences Campus, University of Puerto Rico (UPR), San Juan, Puerto Rico.
3. Puerto Rico Central Cancer Registry, San Juan, Puerto Rico.
4. Cancer Control and Population Sciences Program, University of Puerto Rico Comprehensive Cancer Center, San Juan, Puerto Rico.
5. Division of Infectious Diseases, School of Medicine, University of California, San Francisco, California.