Chinese version of the Constant-Murley questionnaire for shoulder pain and disability: a reliability and validation study oleh Min Yao, Long Yang, Zuo-yuan Cao, Shao-dan Cheng, Shuang-lin Tian, Yue-li Sun, Jing Wang, Bao-ping Xu, Xiao-chun Hu, Yong-jun Wang, Ying Zhang, Xue-jun Cui