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Article History

Received: 19 January 2018

Accepted: 22 May 2018

First Online: 31 May 2018

Ethics approval and consent to participate

: Ethical approval was obtained from the Ethics and research committees of all participating institutions: Delta State University Teaching Hospital Oghara: DELSUTH/HREC/2015/024, Niger Delta University Teaching Hospital Okolobri,: NDUTH/REC/0005/2015, University of Benin Teaching Hospital Benin-City: UBTH:ADM/E22/2/VOL.VII/1245, University of Calabar Teaching Hospital, Calabar: UCTH/HREC/33/360, University of Port Harcourt Teaching Hospital, Port Harcourt: UPTH/ADM/90/S.II/VOL.X/668 and University of Uyo Teaching Hospital, Uyo: UUTH/AD/S/96/VOL.XIV/357. The heads of the institutions equally gave approval for participation and access to pertinent publicly accessible data; including instructions to the person(s) in charge of pharmacovigilance at the various institutions who then gave verbal consent as approved by the ethics committees. All ethical considerations were duly observed.

: The authors declare that they have no competing interests.

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