4.7 An application for a TUE will not be considered for retroactive approval except in cases where:  (a) Emergency treatment or treatment of an acute medical condition was necessary, or   (b) due to exceptional circumstances, ther e was insufficient time or opportunity for an applicant to submit, or a TUEC to consider, an application prior to Doping Control,  or  (c) the conditions set forth under 7.13 apply.