Revised Airlie House consensus guidelines for design and implementation of ALS clinical trials by Van Den Berg, L, Sorenson, E, Gronseth, G, Macklin, E, Andrews, J, Baloh, R, Benatar, M, Berry, J, Chio, A, Corcia, P, Genge, A, Gubitz, A, Lomen-Hoerth, C, McDermott, C, Pioro, E, Rosenfeld, J, Silani, V, Turner, M, Weber, M, Brooks, B, Miller, R, Mitsumoto, H