Abdelraouf, O. R., Hamada, H. A., Selim, A., Shendy, W., & Zakaria, H. (2016). Effect of backpack shoulder straps length on cervical posture and upper trapezius pressure pain threshold. The Society of Physical Therapy Science. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5080147/

Abdelraouf, Osama Ragaa, Hamada Ahmed Hamada, Ali Selim, Wael Shendy, and Hoda Zakaria. Effect of Backpack Shoulder Straps Length On Cervical Posture and Upper Trapezius Pressure Pain Threshold. The Society of Physical Therapy Science, 2016.

Abdelraouf, Osama Ragaa, et al. Effect of Backpack Shoulder Straps Length On Cervical Posture and Upper Trapezius Pressure Pain Threshold. The Society of Physical Therapy Science, 2016.