Allwood B W, Maarman G J, Kyriakakis C G, Doubell A F
Division of Pulmonology, Department of Medicine, Faculty of Medicine and Health Sciences, Stellenbosch University, Cape Town, South Africa.
S Afr Med J. 2018 Jun 26;108(7):12339. doi: 10.7196/SAMJ.2018.v108i7.13359.