Acknowledgements
FB is Senior Research Associate of the National Fund for Scientific Research (FNRS) Belgium. This work has been partly funded by the ARC from the ULg ‘The somatotrope GHRH–GH–IGF-1 axis and immune thymus recovery’.
Potential conflict of interest
Disclosure forms provided by the authors are available with the full text of this article online at http://dx.doi.org/10.1080/10428194.2017.1283688.