1. The South African DST/NRF Centre of Excellence in Epidemiological Modelling and Analysis (SACEMA), University of Stellenbosch, Stellenbosch, South Africa.
2. School of Computational and Applied Mathematics, University of the Witwatersrand, Johannesburg, South Africa.
3. Department of Actuarial Science and the African Collaboration for Quantitative Finance and Risk Research, University of Cape Town, Cape Town, South Africa.