**5. Conclusions**

The majority of experts use contingency contracts for their patients with AN. Most contracts involve weekly weight goals and there is strong consensus regarding the most frequent positive and negative consequences following weight gain or loss. This knowledge can help define and implement best practices concerning contingency contracting in the treatment of patients with AN. It also gives insight into current practice, and is therefore useful for the planning of further studies aiming to improve the efficacy of treatments procedures for patients with AN. For clinical practice, using external motivators such as contingency contracts as well as targeting internal motivation (e.g., by using motivational interviewing) is proposed.

**Author Contributions:** Conceptualization, K.Z., F.J., S.Z., K.E.G. and G.R.; Methodology, K.Z., F.J., S.Z., K.E.G. and G.R.; Formal Analysis, K.Z.; Investigation, K.Z., F.J., S.Z., K.E.G., G.R., C.N., H.-C.F., S.H., M.R., M.d.Z., J.v.W., A.Z., A.D., M.B., B.L. and C.S.; Resources, F.J., K.E.G. and S.Z.; Data Curation, K.Z.; Writing-Original Draft Preparation, K.Z.; Writing-Review & Editing, K.Z., F.J., S.Z., K.E.G., G.R., C.N., H.-C.F., S.H., M.R., M.d.Z., J.v.W., A.Z., A.D., M.B., B.L. and C.S.; Visualization, K.Z.; Supervision, F.J. and S.Z.; Project Administration, K.Z.

**Acknowledgments:** K.Z. is supported by the "Konrad Adenauer Stiftung" (Konrad Adenauer Foundation).

**Conflicts of Interest:** The authors declare no conflict of interest.

#### **References**


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