Timothy A. Waidmann Barbara A. Ormond Randall R. Bovbjerg

A Modi A Tostmann M Gobin C Quigley P Crook N Boxall J Paul T Cheasty N Gill G Hughes

hesam ghiasvand department of health economics, school of health management and information sciences, iran university of medical sciences, tehran, ir iran hassan abolghasem gorji department of health services management, school of health management and information sciences, iran university of medical sciences, tehran, ir iran; health management and economics research center, iran university of medical sciences, tehran, ir iran mohammadreza maleki department of health services management, school of health management and information sciences, iran university of medical sciences, tehran, ir iran mohammad hadian department of health economics, school of health management and information sciences, iran university of medical sciences, tehran, ir iran; department of health economics, school of health management and information sciences, iran university of medical sciences, tehran, ir iran. tel: +98-2188794302, fax: +98-2188883334