1. Department of General Surgery, The Second Affiliated Hospital, Southwest Medical University, Luzhou, Sichuan 646000, P.R. China
2. Department of Neonatology, The Second Affiliated Hospital, Southwest Medical University, Luzhou, Sichuan 646000, P.R. China
3. Department of Ophthalmology, Chongqing General Hospital, Chongqing 400014, P.R. China
4. Department of Molecular Diagnostics, Center for Clinical Molecular Medical Detection, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China