Huperzine A for Alzheimer's Disease: A Systematic Review and Meta-Analysis of Randomized Clinical Trials Yang, Guoyan ; Wang, Yuyi ; Tian, Jinzhou ; Liu, Jian-Ping Abstract Publication: PLoS ONE Pub Date: September 2013 DOI: 10.1371/journal.pone.0074916 Bibcode: 2013PLoSO...874916Y