Linear colliders based on laser-plasma accelerators by Schroeder, CB, Albert, F, Benedetti, C, Bromage, J, Bruhwiler, D, Bulanov, SS, Campbell, EM, Cook, NM, Cros, B, Downer, MC, Esarey, E, Froula, DH, Fuchs, M, Geddes, CGR, Gessner, SJ, Gonsalves, AJ, Hogan, MJ, Hooker, SM, Huebl, A, Jing, C, Joshi, C, Krushelnick, K, Leemans, WP, Lehe, R, Maier, AR, Milchberg, HM, Mori, WB, Nakamura, K, Osterhoff, J, Palastro, JP, Palmer, M, Poder, K, Power, JG, Shadwick, BA, Terzani, D, Thevenet, M, Thomas, AGR, van Tilborg, J, Turner, M, Vafaei-Najafabadi, N, Vay, J-L, Zhou, T, Zuegel, J