Zaidi, Sabeen Khurshid, et al. “ACTIVE SURVEILLANCE FOR ASYMPTOMATIC COLONIZATION WITH MULTIDRUG RESISTANT GRAM-NEGATIVE BACILLI IN PRE-OPERATIVE PAEDIATRIC CONGENITAL CARDIAC DISEASE PATIENTS; PRELIMINARY RESULTS”. Pakistan Armed Forces Medical Journal, vol. 65, no. (SUPPL), Mar. 2015, pp. S39-42, https://pafmj.org/PAFMJ/article/view/4409.