Shahzad, M.; Ayyaz, S.; Humayun, G.; Kamran, M.; Dogar, L.; Shaheen, A.; Kazmi, A.; Hafeez, A.; Saheen, M. A COMPARISON OF DRUG RESISTANCE PATTERN IN CATEGORY-I FAILURE VERSUS CATEGORY-I RELAPSE PULMONARY TB PATIENTS ATTENDING A TERTIARY CARE HOSPITAL IN SOUTH PUNJAB, PAKISTAN. IS WHO CATEGORY-II ATT REGIMEN APPROPRIATE?. Pak J Chest Med 2015, 19.