Poor sleep quality association with higher lung cancer risk: a nested case-control study oleh Guo-Tian Ruan, Ya-Ping Wei, Yi-Zhong Ge, Li-Shun Liu, Zi-Yi Zhou, Sultan Mehmood Siddiqi, Qiang-Qiang He, Shu-Qun Li, Jia-Feng Xu, Yun Song, Qi Zhang, Xi Zhang, Ming Yang, Ping Chen, Yong Sun, Xiao-Bin Wang, Bin-Yan Wang, Han-Ping Shi