GSK Consumer Healthcare, St George's Avenue, Weybridge, Surrey, KT13 0DE, UK. Electronic address: charles.x.parkinson@gsk.com. GSK Consumer Healthcare, St George's Avenue, Weybridge, Surrey, KT13 0DE, UK. Electronic address: gary.r.burnett@gsk.com. GSK Consumer Healthcare, St George's Avenue, Weybridge, Surrey, KT13 0DE, UK. Electronic address: jonathan.e.creeth@gsk.com. GSK Consumer Healthcare, St George's Avenue, Weybridge, Surrey, KT13 0DE, UK. Electronic address: richard.j.lynch@gsk.com. Syneos Health, Raheja Mindspace, Building No. 12 B, 3rd Floor, Hyderabad, 500081, India. Electronic address: chandrashekhar.budhawant@syneoshealth.com. Oral Health Research Institute,415 Lansing Street, Indianapolis, IN, 46202-2876, United States. Electronic address: flippert@iu.edu. Oral Health Research Institute,415 Lansing Street, Indianapolis, IN, 46202-2876, United States. Electronic address: ahara@iu.edu. Oral Health Research Institute,415 Lansing Street, Indianapolis, IN, 46202-2876, United States.