Author contributions
RECRUITMENT
AMC was the principal investigator for the study. AMC, JDB, AMH, S-YT, GBR were co-investigators on the grant application and as such were involved with the original design. SC, AMH, JDB, AMC were involved with study coordination and were responsible for the day to day running of the trial, recruitment and sample collection. All authors (SC, AMH, JDB, S-YT, GBR, AMC) contributed to the conceptualization, data curation, analysis, statistical interpretation, writing and preparation of this manuscripts for publication.