Javeria, Masroor Ellahi Babar, Akhtar Ali, Asif Nadeem, Abdul Wajid, Sajjad Ali Shah, Sadaf Rashid, Muhammad Wasim and Muhammad Abdullah, 2017. Association between the COMT Gene and Obsessive Compulsive Disorder: A Case-Control Study. Pakistan J. Zool., 49: 1921-1924.