A masseur-physiotherapist who participated in the treatment of a person during the illness from which the person died may only take advantage of inter vivos and testamentary dispositions made in his favour by the person during the course of this illness in the cases and under the conditions set out in article 909 of the Civil Code. Nor may he abuse his influence to obtain a mandate or enter into a contract for valuable consideration under conditions that would be abnormally favourable to him.