Puumalainen, Marjo-Riitta
Lessel, Davor
RĂ¼themann, Peter
Kaczmarek, Nina
Bachmann, Karin
Ramadan, Kristijan
Naegeli, Hanspeter
Article History
Received: 7 October 2013
Accepted: 19 March 2014
First Online: 28 April 2014
Competing interests
: The authors declare no competing financial interests.