[1] Johns Hopkins Univ, Sch Med, Dept Med, Baltimore, MD 21205 USA
[2] Johns Hopkins Univ, Bloomberg Sch Publ Hlth, Dept Hlth Policy & Management, Baltimore, MD 21205 USA
[3] NIMH, Rockville, MD 20857 USA
[4] Univ Penn, Dept Family Med, Philadelphia, PA 19104 USA
[5] Univ Colorado, Hlth Sci Ctr, Dept Family Med, Denver, CO 80202 USA
[6] RAND Corp, Hlth Program, Santa Monica, CA USA
[7] VA Greater Los Angeles Healthcare Syst, Dept Med, Los Angeles, CA USA
[8] Univ Calif Los Angeles, Dept Med, Los Angeles, CA 90024 USA