Measurement of the 1s-2s energy interval in muonium by Meyer, V, Bagayev, SN, Baird, P, Bakule, P, Boshier, MG, Breitrueck, A, Cornish, S, Dychkov, S, Eaton, G, Grossmann, A, Huebl, D, Hughes, V, Jungmann, K, Lane, I, Liu, Y, Lucas, D, Matyugin, Y, Merkel, J, Putlitz, G, Reinhard, I, Sandars, P, Santra, R, Schmidt, P, Scott, C, Toner, W