Causes and economic consequences of differential waiting time : a case study on Gall-stone surgery (Cholecystectomy) / A. K. M. Zahirul Haq Zahirul Haq, A. K. M. 362.1 HAC Thesis (M.phil.) -- Institute of Health Economics, University of Dhaka, 2010. Includes bibliographical references. Dhaka : University of Dhaka, 2010. 2010. 4650 Text xv, 106 p. : eng