Authors: Michael Pfreundschuh, Evelyn Kuhnt, Lorenz Trümper, Anders Österborg, Marek Trněný, Lois E. Shepherd, Devinder Gill, Jan Walewski, Ruth Pettengell, Ulrich Jaeger, Pier Luigi Zinzani, Ofer Shpilberg, Stein Kvaløy, Peter de Nully Brown, Rolf A. Stahel, Nöel Milpied, Armando López‐Guillermo, Viola Poeschel, Sandra Graß, Markus Loeffler, Niels Murawski - The Lancet 2011 cited by 811