The immune status of patients with psoriasis vulgaris of blood-stasis syndrome and blood-dryness syndrome: a qualitative evidence synthesis - Yan, Jun-Tang; Wang, Qing-Guo; Liu, Xiao-Qian; Li, Bin; Ru, Yi; Hong, Seokgyeong; Sun, Xiao-Ying; Liu, Min; Li, Xin (Annals of Palliative Medicine, 2020)