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Article History

Received: 9 March 2017

Accepted: 18 April 2018

First Online: 8 May 2018

Author information

: Amen A. Bawazir: corresponding author. MBBS, MD Epid, PhD. Associate Professor, College of Medicine and Health Sciences. Aden University, Yemen. Community and environmental Health, College of Public Health & Health Informatics. KSAU-HS. Email: bawazir56@hotmail.com Telephone: + 966,114,295,422.

: This study was conducted after approval of the Cancer Research Center in Aden. The Cancer Research Center in Aden City as an academic unit in the College of Medicine, University of Aden acted as a formal ethics committee in in approving this study (CRD-13/#05). No informed consent needed for this type of study with no extra burden for participants and anonymized data.

: The author declare that he has no competing interests.

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