Evaluating dextrorphan as a wastewater biomarker for cough suppressant use: A longitudinal study in China
Water Research, Volume 285, 1 October 2025, 124119. Xue-Ting Shao, Xin-Dong Ma, Jing-Long Li, Jake W. O’Brien, Kevin Thomas, De-Gao Wang https://www.sciencedirect.com/science/article/pii/S0043135425010267