[1] Univ Hosp Verona, Clin Biochem Sect, Ple LA Scuro 10, I-37134 Verona, Italy
[2] Univ Washington, Seattle, WA 98195 USA
[3] IRCCS Galeazzi, Milan, Italy
[4] Vita & Salute San Raffaele Univ, Milan, Italy
[5] Umea Univ, Dept Nursing, Umea, Sweden
[6] Paracelsus Med Univ, Dept Lab Med, Salzburg, Austria
[7] Preanalyt Syst, BD Life Sci, Oxford, England
[8] Worcestershire Acute Hosp NHS Trust, Worcester, England
[9] North Bristol NHS Trust, Bristol, Avon, England
[10] CHRU Tours, Serv Reanimat Polyvalente, Tours, France
[11] Univ Munich, Munich, Germany
[12] Odense Univ Hosp, Dept Clin Biochem & Pharmacol, Odense, Denmark
[13] YYF, Cardiff, S Glam, Wales
[14] Univ Hosp Wales Caerphilly & Cardiff, Cardiff, S Glam, Wales
[15] Hosp Univ San Juan, Clin Lab, Alacant, Spain
[16] Norwegian Qual Improvment Lab Examinat, Bergen, Norway
[17] Isala, Dept Clin Chem, Zwolle, Netherlands
[18] Preanalyt Syst, BD Life Sci, Franklin Lakes, NJ USA
[19] Haukeland Hosp, Lab Clin Biochem, Bergen, Norway
[20] Univ Hosp Leuven, Dept Clin Lab Med, Leuven, Belgium
[21] Univ Hosp Sveti Duh, Dept Med Lab Diagnost, Zagreb, Croatia