Since the founding of the medical contract, several series of ethical norms based on the Hippocratic oath (460-370 bc) have been oriented to provide health care to those who are in need. The professional practice has generated some problems such as negligence (lack of due diligence or care; omission of duty; heedlessness), iatrogenia (disease produced as a consequence of medical or surgical treatment), or new modalities under the scope of the so called medical errors (http://www.ahrq.gov/qual/errorsix.htm).

When these problems are considered from the preventive point …