Researchers wishing to access these anonymised data should complete and submit a data application form, outlining the purpose of their proposed research, ethics approvals that have been obtained, and a list of variables that they wish to access. Applications for access will need to be approved by the LINEA Principal Investigators, Ana Maria Buller (LSHTM) and Joyce Wamoyi (National Institute of Medical Research, Tanzania); the request will be reviewed by the LINEA study team. Interested parties are advised to contact the study investigators to discuss their proposed research. If approved, before the data can be shared, ethical approval must be obtained from your host institution, and a Data Transfer Agreement with LSHTM must also be signed.