1. Kapteyn Astronomical Institute, University of Groningen, PO Box 800, NL-9700AV Groningen, the Netherlands
2. ASTRON, PO Box 2, NL-7990AA Dwingeloo, the Netherlands
3. Department of Natural Sciences, The Open University of Israel, 1 University Road, PO Box 808, Ra’anana 4353701, Israel
4. Department of Physics, University of the Western Cape, Cape Town 7535, South Africa
5. Department of Physics and Electronics, Rhodes University, PO Box 94, Grahamstown 6140, South Africa
6. SKA South Africa, 3rd Floor, The Park, Park Road, Pinelands 7405, South Africa
7. Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia