Dammerer, D.
Liebensteiner, M. C.
Kujala, U. M.
Emmanuel, K.
Kopf, S.
Dirisamer, F.
Giesinger, J. M.
Article History
Received: 21 September 2017
First Online: 25 January 2018
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: The study protocol was approved by the local ethics committee.
: Informed consent was obtained from all individual participants included in the study.