Di Fiore, J M
Poets, C F
Gauda, E
Martin, R J
MacFarlane, P
Article History
Received: 5 July 2015
Revised: 29 September 2015
Accepted: 5 October 2015
First Online: 19 November 2015
Competing interests
: CFP received a research grant from Chiesi Farmaceutici, Parma, Italy, the manufacturer of caffeine citrate in Europe, for a study unrelated to the work submitted. The other authors declare no conflict of interest.