Vale, F. F.
Vadivelu, J.
Oleastro, M.
Breurec, S.
Engstrand, L.
Perets, T. T.
Mégraud, F.
Lehours, P.
Article History
Received: 27 March 2015
Accepted: 21 August 2015
First Online: 21 September 2015
Competing interests
: The authors declare no competing financial interests.