1. American College of Surgeon. American College of Surgeons Definition of Surgery Legislative Toolkit. 1–17 p.
2. Abdul, J.A., Tahrani, P.K., Faizah, A., Gunn, A.K.B., Tan, W.J., Nik, A.N.A., et al. | Surgical Services in Malaysian Hospitals. Natl Healthc Establ Work Stat 2011. 2011.
3. The World Bank. API_SH [Internet]. [cited 2021 Sep 3].
4. World Health Organization. Protecting Workers’ Health Series No. 5, Preventing musculoskeletal disorders in the workplace. WHO Publ [Internet]. 2015;21(1):1–32.
5. Liang, Y., Yao, Z., Matz S. RiskFactors for Work-related Low Back Pain in the Peoplels Republic of China. 1997;26–33.