Improving clinical trials for cardiovascular diseases: a position paper from the Cardiovascular Round Table of the European Society of Cardiology by Jackson, N, Atar, D, Borentain, M, Breithardt, G, van Eickels, M, Endres, M, Fraass, U, Friede, T, Hannachi, H, Janmohamed, S, Kreuzer, J, Landray, M, Lautsch, D, Le Floch, C, Mol, P, Naci, H, Samani, NJ, Svensson, A, Thorstensen, C, Tijssen, J, Vandzhura, V, Zalewski, A, Kirchhof, P