The Sexunzipped Trial: Optimizing the Design of Online Randomized Controlled Trials

Julia V Bailey ¹ , BSc, MBBS, MSc, PhD ; Menelaos Pavlou ² , BSc, MSc, PhD ; Andrew Copas ³ , MSc, PhD ; Ona McCarthy ⁴ , BA(Hons), MSc ; Ken Carswell ⁵ , BA(Hons), Mphil, DClinPsy ; Greta Rait ⁶ , MB ChB, Research MD, FHEA, MRCGP ; Graham Hart ⁷ , BA(Hons), FMedSci, PhD ; Irwin Nazareth ⁶ , MBBS, LRCP, FRCGP, PhD ; Caroline Free ⁴ , MBChB, MRCGP, PhD ; Rebecca French ⁴ , MSc, PhD ; Elizabeth Murray ¹ , FRCGP, FRCP (Edin), PhD

¹ e-Health Unit , Research Department of Primary Care and Population Health , University College London , London , GB

² Department of Statistical Science , University College London , London , GB

³ Department of Infection and Population Health , University College London , London , GB

⁴ London School of Hygiene and Tropical Medicine , London , GB

⁵ Queen Mary , University of London , London , GB

⁶ PRIMENT Clinical Trials Unit , Research Department of Primary Care and Population Health , University College London , London , GB

⁷ Faculty of Population Health Sciences , University College London , London , GB

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