Effect of Sleep Duration and the Time of Falling Asleep on Yin-deficiency Constitution 
XIE Yisha1,ZHU Yanbo1*,XU Jia2,MENG Lingjie1,JIA Liyan3,LYU Xiaoying3
Chinese General Practice . 2020, (2): 209 -214 .  DOI: 10.12114/j.issn.1007-9572.2019.00.581