Journal article (2015) - T Kruse (author), BA van de Pas (author), WM de Vos (author), J van der Oost (author), H Schmidt (author), AJM Stams (author), A Atteia (author), K Krab (author), WR Hagen (author), L Goodwin (author), P Chain (author), S Boeren (author), F Maphosa (author), G Schraa (author)