Authors: Lídia Sabater, Carles Gaig, Ellen Gelpí, Luís Bataller, Jan Lewerenz, Estefanía Torres-Vega, Angeles Contreras, Bruno Giometto, Yaroslau Compta, Cristina Embid, Isabel Vilaseca, Álex Iranzo, Joan Santamaría, Josep Dalmau, Francesc Graus - The Lancet 2014 cited by 551