1. Ministry of Internal Affairs and Communications, Japan, “White Paper: Information and Communications in Japan,” 2016 (in Japanese).
2. Ministry of Health, Labour and Welfare, “Occupational Disease Occurrence Survey Report,” 2018 (in Japanese).
3. Ministry of Health, Labour and Welfare, “Low Back Pain Prevention Guidelines in the Workplace,” 2013 (in Japanese).
4. K. Naminohira and M. Fujimura, “Electromyographic and Kinematical Study of Human Lifting Motion —Effect of Mass of Heavy Object on Motion Methods—,” Japanese J. of Occupational Medicine and Traumatology, Vol.58, No.5, pp. 234-239, 2010 (in Japanese).
5. K. Naminohira, M. Fujimura, and K. Shinkoda, “Electromyographic and Kinematic Study of Lifting Motion in Male Adults —Effects of Mass of the Object on Motion Patterns (The Second Report)—,” Japanese J. of Occupational Medicine and Traumatology, Vol.59, No.5, pp. 245-250, 2011 (in Japanese).