1. DHV BV, PO Box 1132, 3800 BC, Amersfoort, The Netherlands
2. Delft University of Technology, Sanitary Engineering, PO Box 5048, 2600 GA, Delft, The Netherlands
3. Waternet, PO Box 94370, 1090 GJ, Amsterdam, The Netherlands
4. Kiwa Water Research, PO Box 1072, 3430 BB, Nieuwegein, The Netherlands