Tianjin Medical Journal ›› 2021, Vol. 49 ›› Issue (5): 539-544.doi: 10.11958/20203534
• Epidemiological Investigation • Previous Articles Next Articles
LIU Yang, LI Ning, YANG Wen-jie, FAN Pan-ying, NIE Yu-gang, XUE Xiu-juan, ZHANG Guo-long, ZHAO Dong-yang△