Prot# CFTY720D2309: A 24-Month, Dbl-Blind, Rndmzd, Multicenter, Placebo-Cntrld, Parallel-Group Study Comparing the Efficacy&Safety of 0.5mg & 1.25mg Fingolimod(FTY720) Admnstrd Orally 1x Daily vs Placebo in Ptnts w/Relapsing-Remitting Multiple Sclerosis