4. Cladribine, cyclophosphamide, mitoxantrone, natalizumab at any time 13. Patients with any of the following cardiovascular conditions: Resting heart rate < 45 bpm/min Cardiac failure at time of screening (Class III according to NYHA classification) or any severe cardiac as determined by the physician Myocardial infarction during the last 6 months History of Mobitz Type II grade 2 AV block Past or current grade 3 AV block Confirmed history of sick sinus syndrome or sino-atrial heart block arrhythmia requiring current treatment with Class Ia drugs (ajmaline, disopyramid, procainamide, quinidine) hypertension uncontrolled with medication 14. Patients with any of the pulmonary conditions below severe respiratory disease or pulmonary fibrosis Uncontrolled asthma 15. Pregnant or nursing (lactating) women (pregnancy is defined as the state of a female after conception and until the termination of gestation and should be confirmed by a positive hCG laboratory test (> 5 mIU/ml).