[1] Univ Calif San Francisco, Dept Med, San Francisco, CA 94143 USA
[2] Univ Calif Los Angeles, Dept Med, Los Angeles, CA 90024 USA
[3] Univ N Carolina, Gillings Sch Global Publ Hlth, Collaborat Studies Coordinat Ctr, Chapel Hill, NC 27515 USA
[4] Columbia Univ, Dept Med, New York, NY USA
[5] Natl Jewish Hlth, Dept Med, Denver, CO USA
[6] Univ Michigan, Dept Med, Ann Arbor, MI 48109 USA
[7] Univ Washington, Dept Med, Seattle, WA USA
[8] Vet Adm Miami Healthcare, Dept Med, Miami, FL USA
[9] Univ Illinois, Dept Med, Chicago, IL USA
[10] Cornell Univ, Dept Med, Ithaca, NY USA
[11] Univ Alabama Birmingham, Dept Med, Birmingham, AL 35294 USA
[12] Wake Forest Baptist Hlth, Dept Med, Winston Salem, NC USA
[13] Mayo Clin, Dept Med, Phoenix, AZ USA
[14] Univ Utah, Dept Med, Salt Lake City, UT 84112 USA
[15] Johns Hopkins Univ, Dept Med, Baltimore, MD USA