1. Institute of Physiology I, Eberhard‐Karls University of Tübingen, Gmelinstr. 5, 72076 Tübingen
2. Max‐Planck‐Institute for Experimental Medicine, Hermann‐Rein‐Str. 3, 37075 Göttingen, Germany
3. Department of Pharmacology, Merck Research Laboratories, West Point, PA 19486‐0004, U.S.A.
4. Seconda Universita Degli Studi di Napoli, Cattedra di Nefrologia, Via S. Pansini 5, Padiglione 17, 80131 Napoli, Italy