1. aSchool of Child and Adolescent Health, University of Cape Town, Anzio Road, Cape Town, 7925, South Africa.
2. bAeras Global TB Vaccine Foundation, Rockville, United States of America (USA).
3. cDepartment of Statistical Sciences, University of Cape Town, Cape Town, South Africa.
4. dOtsuka Pharmaceutical Development and Commercialization Inc., Rockville, USA.