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. 2020 Oct 14;20:507. doi: 10.1186/s12888-020-02903-7

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 3 — Inclusion (↓)/Exclusion (→) procedures for recruitment. Pre-screening begins at Stage 1. Individuals are screened with the ED100K online questionnaire [113] for lifetime eating disorder symptoms as well as genetic testing. Participants are excluded if screening reveals them to be dizygotic or if the unaffected co-twin is discovered to be affected. Screening at Stage 2 is more intensive and includes telephone interviews by trained interviewers conducting the Eating Disorder Examination [EDE [23]], Mini-International-Neuropsychiatric-Interview [MINI, [106]], and the Eating Disorders section of the Structured Clinical Interview for DSM-5 [SCID-5 [32]]. If all criteria fulfilled and participants remain interested in participating, they are invited to participate in the 30 h study protocol