Received: 27 May 2019
Accepted: 12 October 2019
First Online: 30 October 2019
Ethics approval and consent to participate
: This study was ethically cleared b Institutional Review Board (IRB) of the College of Medicine and Health Sciences, Hawassa University (Reference number: IRB/158/10). Permission was obtained from Hawassa city health office and owner/manager of the food establishments. Written informed consent was obtained from each study participant.
: Not applicable.
: The authors declare that they have no competing interests.