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Article History

Received: 25 February 2018

Accepted: 8 August 2018

First Online: 16 August 2018

Ethics approval and consent to participate

: Ethical approval for this study was obtained by the data creators from the “Institut National de la Statistique et de l’Analyse Economique”, 01 PO Box 323, Cotonou, République du Bénin; Telephone: (229) 21–308-244/21–308-245; Fax: (229) 2130–8246; Email: insae@insae-bj.org; Site web: . Informed consent was obtained from all the study participants after all the issues relating to the study were described to them in detail at the time of data collection. Each consenting participant was asked to sign an appropriate agreement form before the interview. Parental authorization had been requested for minor participants (those under the age of 16) before their own consent.

: ‘Not applicable’.

: The authors declare that they have no competing interests.

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