A Randomized Controlled Trial Protocol of Herbal Formulas for Modifying Susceptible Body Constitution to Enhance COVID-19 Resistance in Hong Kong Residents - Chen, Guoming; Zhang, Cheng; Li, Shuo; Yang, Qingyi; Gao, Yini; He, Niancai; Tang, Guoyi; Qian, Xinlan; Zhou, Huiping; Feng, Yibin (Journal of Thoracic Disease; Online First, 2026)