ACKNOWLEDGEMENTS
We are grateful to Claudia Bieber and Gabrielle Stalder for technical
advice, to Andrea Chirifre, Javier Millan and Jordi GrÃfols for
conducting veterinarian work, to Antoni Arrizabalaga, Pilar Saborit and
Silvia Miguez for logistic support and to Matthieu Stigler and Timothy
Cline for helping with R packages.