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Convention relative to the Treatment of Prisoners of War. Geneva, 27 July 1929.
Part IV : End of captivity #Section I : Direct repatriation and accommodation in a neutral country - Art. 69.
Art. 69. On the opening of hostilities, belligerents shall come to an understanding as to the appointment of mixed medical commissions. These commissions shall consist of three members, two of whom shall belong to a neutral country and one appointed by the detaining Power; one of the medical officers of the neutral country shall preside. These mixed medical commissions shall proceed to the examination of sick or wounded prisoners and shall make all appropriate decisions with regard to them.
The decisions of these commissions shall be decided by majority and shall be carried into effect as soon as possible.