Related Rule
Cameroon
Practice Relating to Rule 26. Medical Activities
Cameroon’s Instructor’s Manual (2006) states:
Protection of Non-Combatants in Combat Zones
Medical and religious personnel must fulfil their tasks under the special protection of the belligerents; amongst other things, they must provide assistance in the various combat zones and when circumstances require.
1. Medical Personnel
The Occupying Power cannot instruct the medical personnel irrespective of for whom they are carrying out their mission, except for medical reasons (it is thus unlawful for the Occupying Power to instruct the civilian medical personnel to give priority in their care to its wounded and sick to the detriment of the wounded and sick of the occupied territory).
Lastly, the Occupying Power must not force the civilian medical personnel to carry out tasks incompatible with its humanitarian mission. 
Cameroon, Droit des conflits armés et droit international humanitaire, Manuel de l’instructeur en vigueur dans les forces de défense, Ministère de la Défense, Présidence de la République, Etat-major des Armées, 2006, p. 229, § 541.
The manual also states: “In the domain of medical activities, only reasons of medical urgency authorize a priority in the order of care.” 
Cameroon, Droit des conflits armés et droit international humanitaire, Manuel de l’instructeur en vigueur dans les forces de défense, Ministère de la Défense, Présidence de la République, Etat-major des Armées, 2006, p. 93, § 352.20.
Cameroon’s Instructor’s Manual (2006) states:
Protection of Non-Combatants in Combat Zones
Medical and religious personnel must fulfil their tasks under the special protection of the belligerents; amongst other things, they must provide assistance in the various combat zones and when circumstances require.
1. Medical Personnel
It is … prohibited to compel the medical personnel to give information regarding the wounded and sick whom they care for: information regarding the activity, relations, location or existence of the wounded. 
Cameroon, Droit des conflits armés et droit international humanitaire, Manuel de l’instructeur en vigueur dans les forces de défense, Ministère de la Défense, Présidence de la République, Etat-major des Armées, 2006, p. 229, § 541.