5.5.3  Where an Athlete is included in an international Registered Testing Pool or Testing Pool by TWIF  and in a national (Registered ) Testing Pool by their National Anti -Doping Organi sation , the National Anti -Doping Organi sation  and TWIF  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.