Liu, Bo, and Xiong Zhang. “Clinical Observation on the Treatment of Laryngogenic Cough by Combining Sai Gan and Ephedra Soup With Zi Cough San”. Journal of Contemporary Medical Practice 6, no. 8 (August 21, 2024): 99–102. Accessed May 13, 2025. https://www.bryanhousepub.com/index.php/jcmp/article/view/375.