American College of Gastroenterology. (n.d.). Peptic ulcer disease. Retrieved from http://patients.gi.org/topics/peptic-ulcer-disease.
American College of Gastroenterology. (n.d.). Understanding ulcers, NSAIDs and GI bleeding. Retrieved from http://s3.gi.org/patients/pdfs/UnderstandGIBleednew.pdf.
Anema, J. R., Cuelenaere, B., van der Beek, A. J., Knol, D. L., de Vet, H. C. W., & van Mechelen, W. (2004). The effectiveness of ergonomic interventions on return-to-work after low back pain; a prospective two year cohort study in six countries on low back pain patients sicklisted for 3-4 months. Occupational and Environmental Medicine, volume 61(4), 289-294.
