Cummings, Steven R.
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Univ Calif San Francisco, Dept Med, San Francisco, CA 94143 USA
Univ Calif San Francisco, Dept Epidemiol & Biostat, San Francisco, CA 94143 USA
Calif Pacific Res Inst, San Francisco Coordinating Ctr, San Francisco, CA USA Univ Calif San Francisco, Dept Med, San Francisco, CA 94143 USA