Ali Zohair Nomani , Muhammad Saleem Qureshi , Musarrat Iqbal , Hanna Nomani ,Saba Binte Kashmir , Marina Wazir , Kamran Rasheed. “Frequency and Types of Gastrointestinal Tract Related Interventional Health Care Facilities”. Journal of Rawalpindi Medical College, vol. 17, no. 1, June 2013, https://journalrmc.com/index.php/JRMC/article/view/534.