Rammayan, Thitima, and Paphonkan Boonyarit. 2017. “Prevalence of Musculoskeletal Symptoms at Upper Body Parts Due to Smartphone Using Among Lower Secondary School Students”. Srinagarind Medical Journal 31 (6):392-99. https://li01.tci-thaijo.org/index.php/SRIMEDJ/article/view/75280.