The card attached upon joining school 11. The Child parent, or his guardian shall present the health card among the papers of the Child joining school, at the preuniversity education stages; provided that the physician shall register therein the results of the periodical medical examination of the Child, and such as may occur in his health condition of diseases or afflictions; provided that it shall be kept in the school file. Periodical medical examination procedure 12. The health authority, by a decision thereof, shall specify the procedure of periodical medical examination of school Children and the dates of conducting the same, in accordance with the laws and regulations organizing that. Addition of substances inconsistent with specifications to Child food prohibited 13.(1) No coloured or preservative substances, nor food additives shall be added to the foods and preparations specified for the nutrition of Children, unless they are identical to the conditions and specifications validated by the competent bodies. (2) No advertisement of the foods and preparations specified for nutrition of Children shall be made, save after their registration and obtaining a licence to circulate the same from the competent bodies, in particular the mother milk substitutes . 12