Humaira Mehmood, Madiha Shafi, Shams ul Arifin Qasmi, Muhammad Saeed Afsar, Samina Mohsin, and Qurat-Ul-Ain, “Assessment of frequency, risk category and intervention needs in psychoactive drug users by using WHOASSIST Questionnaire among medical students in Karachi”, J Pak Med Assoc, vol. 72, no. 7, pp. 1285–1288, Feb. 2022.