1. Water Quality Center, Marquette University, Civil & Environmental Engineering, PO Box 1881 Milwaukee, WI 53233, USA
2. Kleen Test Products, 1611 Sunset Road, Port Washington, WI 53074, USA
3. Department of Biological Sciences, UW-Milwaukee, Milwaukee, WI 53201, USA
4. Grup de Microbiologia Marina, Institut Mediterrani d’Estudis Avançats, Mallorca, E-07190 Esporles, Spain
5. Institute of Bacteriology, Mycology and Hygiene, University of Veterinary Medicine Vienna, Veterinärplatz 1, A-1210 Vienna, Austria