1. Service of Nephrology, Hospital of Sion, Centre Hospitalier du Valais Romand, Sion, Switzerland
2. Clinical and Research Laboratory on Urinary Sediment, U.O. di Nefrologia, Dialisi e Trapianto di rene, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milano, Italy
3. Service of Clinical Chemistry & Toxicology, Central Institute of Hospitals, Hospital of Wallis, Sion, Switzerland
4. Service of Internal Medicine, Hospital of Sion, Centre Hospitalier du Valais Romand, Sion, Switzerland