Received: 5 April 2021
Accepted: 13 October 2021
First Online: 30 October 2021
: All methods were carried out in accordance with relevant guidelines and regulations from study design to the analysis. Ethical approval was obtained from the Institutional Review Board at Indiana University under the Study Nos. 1311659626 and 1611016230. This study utilized retrospective data, thus the research ethics review committee at Indiana University waived the need for an informed consent. The confidentiality of maternal data was always maintained, only study identification number unique to each subject were available in the dataset used in this study.
: Not applicable
: The authors declare that there are no conflicts of interest.