Effects of 60° Semi-recumbent Position on Preventing Ventilator-associated Pneumonia: A Single-blind Prospective Randomised Clinical Trial Journal title: Journal of Clinical and Diagnostic Research Authors: Hadi Hassankhani, Sharzad Akbarzadeh, Sima Lakdizaji, Atabak Najafi, Ebrahim Aliafsari Mamaghani Subject(s):