Ettema, H. B., Hoppener, M. R., Henny, C. P., Büller, H. R., & Verheyen, C. C. P. M. (2005). Compliance of dutch orthopedic departments with national guidelines on thromboprophylaxis. Acta Orthopaedica, 76(1), 99–103. https://doi.org/10.1080/00016470510030409