1. Department of Pediatrics, University of California San Diego, La Jolla, CA
2. Department of Pediatrics, China-Japan Friendship Hospital, Beijing, China
3. Xinxiang Medical University, Xinxiang, China
4. Department of Pathology, University of California San Diego, La Jolla, CA
5. Department of Microbiology, University of Colorado School of Medicine, Aurora, CO
6. Department of Pediatrics, University of Colorado School of Medicine, Aurora, CO
7. Department of Reproductive Medicine, University of California San Diego, La Jolla, CA