exercise.51 In regard to medical services that should be provided to prisoners, the Rules state, inter alia, that “[t]he medical officer shall see and examine every prisoner as soon as possible after his admission and thereafter as necessary, with a view particularly to the discovery of physical or mental illness, and the taking all necessary measures[.]”52 51. It is also relevant to recall that the Principle 24 for the Protection of All Persons under Any Form of Detention or Imprisonment establishes: “A proper medical examination shall be offered to a detained or imprisoned person as promptly as possible after his admission to the place of detention or imprisonment, and thereafter medical care and treatment shall be provided whenever necessary. This care and treatment shall be provided free of charge.” 53 52. In regard to this first hospitalization of Mr. Pedro Vera Vera in the Regional Hospital of Santo Domingo de los Colorados, the Court notes that pursuant to the expert report of Hans Petter Hougen and Önder Özkalipci, not contested by the parties (supra para. 20), during this stage, the doctors who cared for him committed various omissions that constituted “gross medical negligence.”54 On the one hand, the expert witnesses noted that there is no record that “an assessment of his vital signs, including arterial tension, on the day he was discharged from the hospital” was carried out. Moreover, given that the registration record of the emergency room noted that the alleged victim had a bullet lodged in the subcutaneous tissue of the left side,55 “more examinations were need[ed] in order to determine the bullet's trajectory and whether it w[as] necessary to initiate surgical treatment.” According to the experts, “[t]his is of general medical knowledge.”56 53. Furthermore, the experts mentioned that given that on two occasions Mr. Vera Vera “vomited food residue of a brown color” (supra para. 49), the doctors of the Regional Hospital should have “verified whether there existed a gastrointestinal or intraperioneal hemorrhage” by means of “some medical 51 Cf. Case of Raxcacó Reyes V. Guatemala. Merits, Reparations and Costs. Judgment of September 15, 2005. Series C No. 133, para. 99. Minimum Rules of Nations for the Treatment of Prisoners, adopted by the First Congress of the United Nations on the Prevention of the Crime and Treatment of Delinquents, held in Genieva in 1995, and approved by the Economic and Social Council in its resolution 663C (XXIV) of July 31, 1957 and 2076 (LXVII) on May 13, 1977 52 Rule 24 of the Minimum Rules of the United Nations for the Treatment of Prisoners, supra note 52. 53 Case of De la Cruz Flores V. Perú, supra note 40, para. 133. Principle 24 of the Body of Principles for the Protection of All Persons under Any Form of Detention or Imprisonment, Adopted by the General Assembly in resolution 43/173, of December 9, 1988. 54 Expert testimony of Messers. Hans Petter Hougen and Önder Özkalipci (case file of Merits, tomo I, folio 572). 55 Cf. Clinical history of Pedro Miguel Vera Vera, First Internment, Emergency Services, Hospital of Santo Domingo de los Colorados (case file of annexes to the application, annex 8, folio 25). 56 Expert testimony of Messers. Hans Petter Hougen and Önder Özkalipci (case file of Merits, tomo I, folio 572). 22