1. Center for Health Policy and Research, University of California Los Angeles, Los Angeles, CA, USA
2. Department of Health Policy and Management, Fielding School of Public Health, University of California Los Angeles, Los Angeles, CA, USA
3. Department of Health Policy and Administration, College of Public Health, University of the Philippines Manila, Manila, Philippines
4. Department of Epidemiology and Biostatistics, College of Public Health, University of the Philippines Manila, Manila, Philippines