1. Department of Nephrology; Hospital Fernando da Fonseca; Lisbon Portugal
2. Department of Nephrology; Helsinki University Central Hospital; Helsinki Finland
3. Department of Nephrology; Hospital Universitari de Bellvitge; University of Barcelona; IDIBELL; L'Hospitalet de Llobregat Spain
4. Central Unit of Clinical Research and Clinical Trials (UCICEC), IDIBELL; L'Hospitalet de Llobregat Spain