5.5.3  Where an Athlete is included in an international Registered Testing Pool b y the IOF and in a national Registered Testing Pool by their National Anti -Doping Organization, the National Anti -Doping Organization and the IOF  shall agree between themselves which of them shall accept that Athlete' s whereabouts filings; in no case shall an Athlete be required to make whereabouts filings to more than one  of them.