Ethics approval and consent to participate
MAY
The study was submitted to the cantonal ethics committee in Geneva (Req-2018-00356) who answered that, according to Swiss law, the app being no medical device, the study did not legally need approval from this commission. Therefore, the commission did not formally review our proposal, but answered that: ‘everything indicates that this study will take place in compliance with the general ethical principles applicable to any research involving people’ [e-mail dated 16 May 2018; address: Commission Cantonale d’Ethique de la Recherche (CCER), rue Adrien-Lachenal 8, 1207 Geneva, Switzerland]. Clinical trial registration: ISRCTN Registry: ISRCTN11318024, 17 May 2018. 