[1] Stanford Sch Med, Program Immunol, Stanford, CA USA
[2] Stanford Sch Med, Med Scientist Training Program, Stanford, CA USA
[3] Stanford Med, Dept Anesthesiol Perioperat & Pain Med, Stanford, CA USA
[4] Univ Calif San Francisco, OB GYN & Reprod Sci, San Francisco, CA USA
[5] Stanford Med, Dept Med Infect Dis, Stanford, CA USA