Funding for this research was provided by:
Familjen Erling-Perssons Stiftelse
Myndigheten för Samhällsskydd och Beredskap
Text and Data Mining valid from 2019-01-22
Received: 29 June 2018
Accepted: 17 December 2018
First Online: 22 January 2019
Ethics approval and consent to participate
: Ethical approvals for different sub-studies were obtained from the Zanzibar Medical Research Ethical Committee and Regional Ethics Review Board, Stockholm, Sweden.
: Not applicable.
: The authors declare that they have no competing interests.
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