Kohlhof, Hendrik
Gravius, Sascha
Kohl, Sandro
Ahmad, Sufian S.
Randau, Thomas
Schmolders, Jan
Rommelspacher, Yorck
Friedrich, Max
Kaminski, Tim P.
Article History
Received: 4 November 2015
Accepted: 26 January 2016
First Online: 12 February 2016
Competing interests
: TPK became after the study employee of AstraZeneca. AstraZeneca was not involved in this study. HK, SG, SK, SA, TR, JS, YR and MF declare that they have no competing financial interests.