Nonregistration, discontinuation, and nonpublication of randomized trials: a repeated metaresearch analysis by Speich, B, Gryaznov, D, Busse, JW, Gloy, VL, Lohner, S, Klatte, K, Taji Heravi, A, Ghosh, N, Lee, H, Mansouri, A, Marian, IR, Saccilotto, R, Nury, E, Kasenda, B, Ojeda-Ruiz, E, Schandelmaier, S, Tomonaga, Y, Amstutz, A, Pauli-Magnus, C, Bischoff, K, Wollmann, K, Rehner, L, Meerpohl, JJ, Nordmann, A, Wong, J, Chow, N, Hong, PJ, Mc Cord-De Iaco, K, Sricharoenchai, S, Agarwal, A, Schwenkglenks, M, Hemkens, LG, von Elm, E, Copsey, B, Griessbach, AN, Schönenberger, C, Mertz, D, Blümle, A, von Niederhäusern, B, Hopewell, S, Odutayo, A, Briel, M