1. KWR Watercycle Research Institute, P.O. Box 1072, 3430 BB Nieuwegein, The Netherlands
2. PWN Water
Supply Company North Holland, P.O. Box 2046, 1990 AA, Velserbroek, The Netherlands
3. Copernicus Institute of Sustainable Development, Utrecht University, Heidelberglaan 2, 3584 CS, Utrecht, The Netherlands