1. Department of Nephrology, Second Clinical College of Nanchong North Sichuan Medical College, Nanchong Central Hospital, Nanchong, P.R. China
2. Department of Nephrology, Suining Central Hospital, Suining, P.R. China
3. Department of Nephrology, Guangyuan Central Hospital, Guangyuan, P.R. China
4. North Sichuan Medical College, Nanchong, P.R. China
5. General Practice Department of Nanchong North, Sichuan Medical College, Nanchong, P.R. China