1. N. Fallentin et al., “Physical strain in care work – Results from a survey in the municipal elderly care,” National Research Centre for the Working Environment, 2007.
2. L. Jensen et al., “Chronic low back pain among nurses aids-an investigation of prevalence and risk factors,” Foundation for working environment, 1998.
3. H. Tanaka et al., “Rehabilitation medical treatment,” Nagai shoten, pp. 313-319, 2005.
4. Y. Kume et al., “Development of the Roboticbed®,” J. of Automotive Technology, Vol.64, No.5, pp. 31-34, 2010 (in Japanese).
5. Y. Takahashi et al., “Basic Study on Self Transfer Aid Robotics,” J. of Robotics and Mechatronics, Vol.18, No.1, pp. 4-10, 2006.