This study will last 32 weeks (8 months) as a maximum. 11 visits will take place (Last visit of Initial Treatment Phase = Baseline of Maintenance Phase) Initial Treatment Phase : Visit 1 (Baseline), 2 (Week 2), 3 (Week 4), 4 (Week 6), 5 (Week 8), Maintenance Phase : Visit 1 (Baseline), 2 (Week 4), 3 (Week 8), 4 (Week 12), 5 (Week 16), 6 (Week 20) , 7 (Week 24)