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Article History

Received: 28 November 2018

Accepted: 23 July 2019

First Online: 16 August 2019

Ethics approval and consent to participate

: The study was approved by the Ethics Committee, School of Public Health, University of Kinshasa.Data are property of DRC’s Ministry of Health. They were collected in accordance with the ethical principles enacted by the Helsinki’s Declaration among others oral consent, due to lower education’s level of population, obtained in the local language for a better understanding in participation and approved by the Ethics Committee, School of Public Health, University of Kinshasa. There was no benefit to the data collection participants.Our study being retrospective, we guarantee the confidentiality of collected data as well as the analysis and results presentation in accordance with the ethical principles.

: Not applicable

: The authors declare that they have no competing interests.