For each study of performance, with the exception of that which does not involve any risk or constraint and in which all the procedures are carried out and the products are used in the usual way, the dossier submitted to the Committee for the Protection of Individuals and to the competent authority shall determine whether it is necessary for the person not to be able to participate simultaneously in any other research referred to in this Title and shall, where appropriate, set a period of exclusion during which the person who is the subject of the research may not participate in any other research. The length of this period varies according to the nature of the research referred to in this Title.