Humaira Mehmood; Madiha Shafi; Shams ul Arifin Qasmi; Muhammad Saeed Afsar; Samina Mohsin; 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 2022, 72, 1285-1288.