Irfan, M.; Shabbir, M.; Zahid, M.; Hayat, A.; Majeed, S. M. I. A RANDOMIZED CONTROLLED CROSS-OVER TRIAL OF STANDARD ITALIAN PROTOCOL VERSUS FRONT-LOADED GLYCERYL TRINITRATE HEAD-UP TILT TEST. Pak Armed Forces Med J 2015, 65 (SUPPL), S81-5.