1. Daniel J. Epstein Department of Industrial and Systems Engineering, University of Southern California Viterbi School of Engineering, Los Angeles, California, USA.
2. Department of Health Policy and Management, Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland, USA.
3. Division of HIV and STD Programs, Los Angeles County Department of Public Health, Los Angeles, California, USA.
4. Department of Health Policy and Management, University of California Los Angeles Fielding School of Public Health, Los Angeles, California, USA.
5. Department of Social Welfare, University of California Los Angeles Luskin School of Public Affairs, Los Angeles, California, USA.
6. Department of Public Policy, University of California Los Angeles Luskin School of Public Affairs, Los Angeles, California, USA.