Funding for this research was provided by:
International Agency for Research on Cancer
American Cancer Society
Received: 1 May 2019
Accepted: 10 July 2019
First Online: 7 August 2019
Ethics approval and consent to participate
: This study was reviewed and approved by the Institutional Review Boards of Addis Ababa University in Ethiopia and the Morehouse School of Medicine in Atlanta, USA, and the IARC Ethics Committee in Lyon, France. Study participants who agreed to participate gave written informed consent.
: Not applicable.
: The authors declared no competing interests.