Received: 15 May 2017
Revised: 26 July 2017
Accepted: 10 August 2017
First Online: 14 December 2017
Compliance with ethical standards
: SAK was a scientific consultant for Quest Diagnostics. SAK and ECJ have active grants with Danone Research. DBP had a grant from the European Hydration Institute and SA Coca-Cola Services NV. ADS is a scientific consultant for Gatorade Sports Science Institute. JHB is a Danone Research employee. The remaining authors declare that they have no competing interests.