1 Northumbria Healthcare NHS Foundation Trust, North Tyneside General Hospital, North Shields, UK
2 Institute of Neuroscience, Newcastle University, Newcastle upon Tyne, UK
3 University College Hospital, University of Ibadan, Ibadan, Nigeria
4 Mawenzi Regional Hospital, Moshi, Tanzania
5 Hai District Hospital, Boman’gombe, Kilimanjaro, Tanzania
6 Kilimanjaro Christian Medical University College, Moshi, Tanzania
7 Institute for Ageing, Newcastle University, Newcastle upon Tyne, UK
8 Institute of Health and Society, Newcastle University, Newcastle upon Tyne, UK
9 The Medical School, Newcastle University, Newcastle upon Tyne, UK