Adjunctive Treatment with Rhodiola Crenulata in Patients with Chronic Obstructive Pulmonary Disease--A Randomized Placebo Controlled Double Blind Clinical Trial. oleh Ming-Lung Chuang, Tzu-Chin Wu, Yau-Tung Wang, Yau-Chen Wang, Thomas C-Y Tsao, James Cheng-Chung Wei, Chia-Yin Chen, I-Feng Lin