Received: 3 February 2020
Accepted: 25 August 2021
First Online: 10 September 2021
: Authorization to survey in 2013 was granted by the Ministry of Health of Zambia and the Institutional Review Board of ICF International, and the Centers for Disease Control and Prevention (CDC) in Atlanta, USA. The data are accessible online (ExternalRef removed<u>).</u> This analysis is part of a study that was approved by Excellence in Research Ethics IRB (REF 2017-Apr-007) in Lusaka, Zambia.
: Not applicable.
: The authors declare that they have no competing interests.