D. ANANDHI, ASWATHY.S, KEERTHIGA.L, & V.P.R.SIVAKUMAR. (2017). Effects of posture on respiratory functions in smart phone users: an observational study. International Journal of Pharma and Bio Sciences, 8(4), 471–477. https://doi.org/10.22376/ijpbs.2017.8.4.b471-477