Comparative Study of Non-motor Symptoms of Patients with Parkinson Disease between Early and Middle and Advanced Phases
LI Jing, CHEN Wei-an, ZHANG Xu, TONG Qiu-ling
Chinese General Practice . 2016, (34): 4201 -4204 .  DOI: 10.3969/j.issn.1007-9572.2016.34.010