1. Institute for Global Health, University College London , 30 Guilford Street, London WC1N 7HT, United Kingdom
2. Department of Community Health Sciences, Aga Khan University , PO Box 3500, Stadium Road, Karachi 74800, Pakistan
3. Department of Community Health Sciences & Associate Vice Provost Research & Graduate Studies, Aga Khan University , PO Box 3500, Stadium Road, Karachi 74800, Pakistan
4. Healthier Societies Program, The George Institute for Global Health, Imperial College London , 84 Wood Lane, London W12 0BZ, United Kingdom