A process evaluation, with mediation analysis, of a web-based intervention to augment primary care exercise referral schemes: the e-coachER randomised controlled trial. - Lambert, Jeffrey; Taylor, Adrian; Streeter, Adam; Greaves, Colin; Ingram, Wendy M.; Dean, Sarah; Jolly, Kate; Mutrie, Nanette; Taylor, Rod S.; Yardley, Lucy; Price, Lisa; Campbell, John (International Journal of Behavioral Nutrition & Physical Activity, 2022)