10000 0000 8819 4698grid.412571.4Research Center for Health Sciences, Institute of Health, Shiraz University of Medical Sciences, Shiraz, Iran
20000 0000 8819 4698grid.412571.4Department of Ergonomics, School of Health, Shiraz University of Medical Sciences, Razi avenue, Shiraz, Iran
30000 0004 0442 8645grid.412763.5Department of Occupational Health Engineering, School of Health, Urmia University of Medical Sciences, Urmia, Iran
© The Author(s). 2018
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.