Received: 7 April 2021
Accepted: 12 August 2022
First Online: 8 September 2022
: The study was approved by the Ethics Committee of the Angolan Ministry of Health (ref. number 032020), which waived the need for written informed consent given the retrospective nature of the study and the use of anonymized data from hospital records. All methods were carried out in accordance with relevant guidelines and regulations.
: NA (Not applicable).
: The authors declare no conflict of interest.