Funding for this research was provided by:
Technische Universität München
Received: 1 December 2021
Accepted: 14 March 2022
First Online: 8 April 2022
: The ACD study was reviewed and approved by the ethics committee of Düsseldorf Medical School (granted 2017/09/22) and the following Ministries in their role as supervisory authorities of the Regional Associations of SHI Physicians: State Ministry of Employment, Health and Social Affairs in North Rhine Westphalia, the State Ministry of Social Affairs, Health, Youth, Families and Seniors in Schleswig Holstein, the Senate for Health and Consumer Protection in Hamburg.In accordance with Sect. 75 and Sect. 67b of Book X of the German Code of Social Law (§67b and §75 SGB X) the regulatory authorities, named above, confirmed that patients and office-based physicians do not need to be asked for written, informed consent in order for administrative data to be used to identify the informal networks of office-based physicians. This is because the data were two-way pseudonymised.We confirm that all methods were performed in accordance with the relevant guidelines and regulations for analyzing routine data [CitationRef removed].
: Not applicable.
: The authors declare that they have no competing interests.