Tabriz University of Medical Sciences Journal of Caring Sciences 2251-9920 6 1 2017 03 01 Zero-Tolerance Policy: The Last Way to Curb Workplace Violence against Nurses in Iranian Healthcare System 1 3 10.15171/jcs.2017.001 EN Hadi Hassankhani Amin Soheili LETTER 10.15171/jcs.2017.001 2017 03 01 2017 03 01