Funding for this research was provided by:
Bangladesh Institute of Development Studies (REF/BIDS/EFBC01)
Article History
Received: 7 April 2024
Accepted: 19 February 2025
First Online: 1 July 2025
Declarations
:
: All procedures were performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. This study was approved by the Institutional Review Board of the Bangladesh Institute of Development Studies (BIDS) under the protocol number PSD/EBCB/07.10/20. All methods were carried out in accordance with relevant guidelines and regulations.
: Informed written consent was obtained from all participants to use their data to further the understanding of OOP cost.
: Not applicable.
: The authors declare no competing interests.