Funding for this research was provided by:
National Institute for Health Research
Article History
Received: 20 November 2019
Accepted: 4 March 2020
First Online: 23 March 2020
Ethics approval and consent to participate
: The study received ethical approval and permissions from the London School of Hygiene and Tropical Medicine Observational Research Ethics Committee (Ref: 12124), the Health Research Authority (Project ID: 224734), and from Research and Development departments in the recruitment areas.The research was conducted in accordance with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.Written informed consent was obtained from all study participants.
: N/A. No personal data included.
: The authors declare that they have no competing interests.