Zill-e-Humayun, Muhammad, et al. “RISK OF TRANSMISSION OF HEPATITIS-B AND C VIRUSES IN UPPER GASTROINTESTINAL ENDOSCOPY – A HOSPITAL BASED STUDY: Risk of Transmission of Hepatitis-B and C Viruses”. Pakistan Armed Forces Medical Journal, vol. 57, no. 2, June 2007, pp. 113-7, https://www.pafmj.org/PAFMJ/article/view/271.