Bi-directional Referrals in Urban and Suburban Community Health Centers:a Comparative Study 
SHI Xiaoxiao,SONG Huijiang,GE Xuhua,JIN hua,WANG Zhaoxin,YANG Sen,SONG Yang,HE Juanmei,ZHU Minjie,YU Dehua
Chinese General Practice . 2021, (1): 30 -35 .  DOI: 10.12114/j.issn.1007-9572.2020.00.269