Implementation Effectiveness of the National Essential Public Health Services:a Qualitative Interview Study Using Grounded Theory 
HE Gaoxing,ZHENG Senshuang,WEN Xin,WANG Yuan,SUN Zhong,LU Wenli
Chinese General Practice . 2020, (34): 4309 -4314 .  DOI: 10.12114/j.issn.1007-9572.2020.00.578