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Marques, Marta M ORCID: https://orcid.org/0000-0002-4797-9557, Matos, Marcela ORCID: https://orcid.org/0000-0001-7320-7107, Mattila, Elina ORCID: https://orcid.org/0000-0001-7805-5982, Encantado, Jorge ORCID: https://orcid.org/0000-0003-0542-8340, Duarte, Cristiana ORCID: https://orcid.org/0000-0002-6566-273X, Teixeira, Pedro J ORCID: https://orcid.org/0000-0001-7202-0527, Stubbs, R James ORCID: https://orcid.org/0000-0002-0843-9064, Sniehotta, Falko F ORCID: https://orcid.org/0000-0003-1738-4269, Ermes, Miikka ORCID: https://orcid.org/0000-0003-4849-9931, Harjumaa, Marja ORCID: https://orcid.org/0000-0002-5919-5709, Leppänen, Juha ORCID: https://orcid.org/0000-0002-6525-543X, Välkkynen, Pasi ORCID: https://orcid.org/0000-0001-7935-2700, Silva, Marlene N ORCID: https://orcid.org/0000-0003-4734-0283, Ferreira, Cláudia ORCID: https://orcid.org/0000-0002-7020-9606, Carvalho, Sérgio ORCID: https://orcid.org/0000-0002-8757-8424, Palmeira, Lara ORCID: https://orcid.org/0000-0001-7191-1002, Horgan, Graham ORCID: https://orcid.org/0000-0002-6048-1374, Heitmann, Berit Lilienthal ORCID: https://orcid.org/0000-0002-6809-4504, Evans, Elizabeth H ORCID: https://orcid.org/0000-0002-3432-3778 and Palmeira, António L ORCID: https://orcid.org/0000-0001-6508-0599 (2021) A Theory- and Evidence-Based Digital Intervention Tool for Weight Loss Maintenance (NoHoW Toolkit): Systematic Development and Refinement Study. Journal of Medical Internet Research, 23 (12). e25305.