[1] Univ Calif San Diego, Sch Med, Dept Med, Div Rheumatol, 9500 Gilman Dr, La Jolla, CA 92093 USA
[2] Univ Calif San Diego, Sch Med, Dept Pediat, Div Environm Sci & Hlth, La Jolla, CA USA
[3] Univ Calif San Francisco, Calif Preterm Birth Initiat, San Francisco, CA USA
[4] Univ Calif San Diego, Herbert Wertheim Sch Publ Hlth & Human Longev Sci, La Jolla, CA USA
[5] Vet Affairs San Diego Healthcare Syst, Dept Rheumatol, San Diego, CA USA
[6] Indiana Reg Med Ctr, Dept Med, Indiana, PA USA
[7] Stanford Univ, Sch Med, Div Immunol & Rheumatol, Palo Alto, CA USA