1. Department of Preventive Dentistry Shanghai Ninth People's Hospital College of Stomatology Shanghai Jiao Tong University School of MedicineNational Clinical Research Center for Oral DiseasesShanghai Key Laboratory of Stomatology Shanghai China
2. Department of Assisted Reproduction Shanghai Ninth People's Hospital Shanghai Jiao Tong University School of Medicine Shanghai China
3. Dental Public Health Faculty of Dentistry University of Hong Kong Hong Kong China