Completed The Preventive Effectiveness of the Individualized Jade Wind-Barrier Herbal Tea Bag on the Common Cold in Elderly With Qi-deficiency Constitution (CCJWBT): A Pragmatic Randomized Controlled Trial NCT05640570 Conditions Common Cold, Elderly With Qi-deficiency Constitution, Infections, +8 more Locations School of Chinese Medicine, Hong Kong Baptist University — Hong Kong, China View Trial Details