1. GlaxoSmithKline Consumer Healthcare, St George's Avenue, Weybridge, Surrey, KT13 0DE, UK
2. Common Cold Centre and Healthcare Clinical Trials, Cardiff School of Biosciences, Museum Avenue, Cardiff University, Cardiff, CF10 3US, UK
3. Department of Obstetrics and Gynecology, Sahlgrenska University Hospital, SE‑416 85 Gothenburg, Sweden