,
Börnhorst, C
Huybrechts, I
Hebestreit, A
Krogh, V
De Decker, A
Barba, G
Moreno, L A
Lissner, L
Tornaritis, M
Loit, H-M
Molnár, D
Pigeot, I
Article History
First Online: 15 September 2014
Competing interests
: The authors declare no conflict of interest.