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Article History

Received: 21 September 2021

Accepted: 10 December 2021

First Online: 4 January 2022

Declarations

:

: All data were anonymous collected by Perined, the Netherlands Perinatal Registry. Personal data are processed by the health care provider in the ‘PraktijkBeheerDeel’ of the Perined database, which is only accessible to the responsible healthcare providers. Before processing of personally identifiable information, the healthcare provider informs the person concerned about this processing by providing an information folder. This indicates that the data will be used anonymous for scientific research, quality improvement and for a number of legally required quality indicators. The healthcare provider is responsible for requesting explicit permission for this processing of their data. They are also informed that they have the option to object to this processing of their data.Ethical approval was deemed unnecessary according to the Central Committee on Research Involving Human Subjects (CCMO in Dutch) based on national guidelines regarding ‘Research Involving Human Subjects’. <i>[Centrale Commissie Mensgebonden Onderzoek (CCMO) in Dutch, Central Committee on Research Involving Human Subjects. Vragenlijstonderzoek (Dutch)/Questionnaire Research. </i>Questionnaire research | Investigators | The Central Committee on Research Involving Human Subjects (ccmo.nl)<i>. Accessed November 22, 2021].</i>Because of its non-invasive nature, this type of research (retrospective cohort study) does not require further ethical approval in the Netherlands. The scientific board and the privacy commission of the perinatal registry Perined gave permission for the analysis of their data to study recurrent stillbirth risk (approval number 11.44). All methods were performed in accordance with the relevant guidelines and regulations of the Amsterdam UMC research code. [ExternalRef removed].

: Not applicable

: The authors declare no competing interests.