For these purposes, the retrospective periods in which prior violations can be considered for purposes of multiple violations under Article 10.9.4 and the statute of limitations set forth in Article 16 are procedural rul es, not substantive rules, and should be applied retroactively along with all of the other procedural rules in these Anti-Doping Rules (provided, however, that Article 16 shall only be applied retroactively if the statute of limitation period has not alrea dy expired by the Effective Date).