[1] Dept Family & Community Med, Albuquerque, NM 87131 USA
[2] Columbia Univ, Dept Biomed Informat, New York, NY USA
[3] Grp Hlth Cooperat Puget Sound, Ctr Hlth Studies, Seattle, WA 98101 USA
[4] Univ Utah, Salt Lake City, UT USA
[5] Natl Marrow Donor Program, Minneapolis, MN USA
[6] George Washington Univ, Sch Med & Hlth Sci, Dept Pediat, Bethesda, MD USA
[7] Univ Penn, Sch Med, Ctr Clin Epidemiol & Biostat, Philadelphia, PA 19104 USA
[8] Univ Calif San Francisco, Dept Med, San Francisco, CA USA
[9] Univ New Mexico, Dept Family & Community Med, Albuquerque, NM 87131 USA