Humayun K. Siddiqui, Samee Siddiqui, Faisal Rehan, Sana Amir Ali. “ Karachi”. Journal of Peoples University of Medical &Amp; Health Sciences Nawabshah. (JPUMHS), vol. 5, no. 1, Mar. 2015, pp. 18-22, http://publication.pumhs.edu.pk/index.php/ojs/article/view/174.