Olsson, Gustaf D
Niedergall, Klaus
Bach, Monika
Karlsson, Björn C G
Tovar, Günter
Nicholls, Ian A
Article History
Received: 12 December 2014
Revised: 16 June 2015
Accepted: 24 June 2015
First Online: 30 September 2015
Competing interests
: The authors declare no conflict of interest.