1. Multiple Sclerosis Clinical Care & Research Centre, Department of Neuroscience, Reproductive Science & Odontostomatology, Federico II University, Via Sergio Pansini 5, 80131, Naples, Italy
2. Department of Public Health, Federico II University, Via Sergio Pansini 5, 80131, Naples, Italy
3. Biogen Italy, Via Giovanni Spadolini 5, 20141, Milan, Italy
4. Department of Primary Care & Public Health, Imperial College, Reynolds Building, St Dunstan's Road, W6 8RP, London, UK