1. Departments of Medicine (A.S., C.C., K.H.K., J.C., X.D., H.D.), School of Medicine, University of California San Diego, La Jolla, California 92093
2. Department of Gastroenterology (B.T.), Zunyi Medical College, Zunyi, Guizhou 563003, People’s Republic of China
3. Reproductive Medicine (H.-h.Z., D.-b.C.), School of Medicine, University of California San Diego, La Jolla, California 92093