Tehran University of Medical Sciences International Journal of Hematology-Oncology and Stem Cell Research 2008-2207 13 4 2019 10 01 Is It Rational to Study Coagulations Test Routinely before Operations and Invasive Procedure: Single Center Retrospective Study 172 173 Hassan Mansouritorghabeh Allergy Research Centre, Ghaem Hospital, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran 2019 07 15 2019 09 30 This is a letter to the editor without abstract. https://ijhoscr.tums.ac.ir/index.php/ijhoscr/article/view/1157 https://ijhoscr.tums.ac.ir/index.php/ijhoscr/article/download/1157/805