A significant trend for increasing head/neck flexion with increasing screen size (3.5 inch smartphone, 7 and 9.5 inch tablet) [ 20 ], and generally greater amount of wrist extension and ulnar deviation as well as muscle activity of upper trapezius, wrist and finger flexors and extensors during the use of a larger compared to a smaller tablet screen size [ 20 , 57 ] were reported.
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The associations of mobile touch screen device use with musculoskeletal symptoms and exposures: A systematic review.
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