Funding for this research was provided by:
Norges Forskningsråd (234487)
Received: 10 August 2017
Accepted: 26 June 2018
First Online: 11 July 2018
Ethics approval and consent to participate
: This study was approved by College of Medicine Research and Ethics Committee (COMREC), the Pharmacies and Poisons Board of Malawi and the Regional Committees for Medical and Health Research Ethics in Norway. All study participants gave informed written consent.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.