Radford, J
McKay, P
Malladi, R
Johnson, R
Bloor, A
Percival, F
Sureda, A
Peggs, K S
Article History
First Online: 16 January 2017
Competing interests
: FP is employed by pH Associates Ltd, who were under a commercial contract with the study sponsor to support the design and management of the study and analysis and reporting of the data. The remaining authors declare no conflict of interest.