1. 1. Bumaschny E, Raffa I, ReichmanP (2013) Preoperative evaluation of the surgical patient. Encyclopedia of Digestive Surgery Galindo and colab 1-20.
2. 2. Gaitán-Duarte H, Eslava-Schmalbach J, Rodríguez-Malagon N, Forero-Supelano V, et al. (2008) Incidence and preventability of adverse events in patients hospitalised in three Colombian hospitals during 2006. Rev Salud Publica 10: 215-226. Link: http://bit.ly/33jbsfP
3. 3. (2008) World Health Organization. Safe Surgery Saves Lives. Global Alliance for Patient Safety. Second global challenge for patient safety. Link: http://bit.ly/2PEcWgz
4. 4. (2009) World Health Organization. Manual of application of the WHO list of verification of the safety of surgery. Safe surgery saves lives. Link: http://bit.ly/2PHdK43
5. 5. Arribalzaga E, Lupica L, Delor S, Ferraina P (2012) Implementation of the safe surgery checklist. Rev Argent Cirug 102: 12-16.