Efficacy of entacapone and pramipexole in treating non-motor symptoms of Parkinson’s disease: a prospective randomized controlled trial 
Bei Zheng1, Wen Guoqiang2, Chen Yi1
Chinese Journal of Tissue Engineering Research . 2019, (31): 5052 -5058 .  DOI: 10.3969/j.issn.2095-4344.1422