[1] Clin Hosp Sveti Duh, Dept Med Lab Diagnost, Zagreb, Croatia
[2] Umea Univ, Dept Nursing, Umea, Sweden
[3] Paracelsus Med Univ, Dept Lab Med, Salzburg, Austria
[4] BD Life Sci Preanalyt Syst, Reading, Berks, England
[5] Worcester Acute Hosp NHS Trust, Dept Clin Biochem, Worcester, England
[6] Acad Med Ctr, Dept Clin Chem, Amsterdam, Netherlands
[7] Umraniye Res & Training Hosp, Istanbul, Turkey
[8] Clin Ctr Serbia, Clin Otorhinolaryngol & Maxillofacial Surg, Belgrade, Serbia
[9] Umea Univ, Clin Chem, Dept Med Biosci, Umea, Sweden
[10] Fac Med, Dept Biomed, Sao Joao Hosp Ctr, Dept Clin Pathol, Porto, Portugal
[11] Univ Porto, Inst Publ Hlth, EPI Unit, Porto, Portugal
[12] Natl Assoc Phlebotomists, London, England
[13] Univ Hosp Arnau de Vilanova, Dept Clin Lab, Lleida, Spain
[14] Bioone GmbH, Kremsmuenster, Austria
[15] Autonomous Nonprofit Org Addit Profess Educ Inst, Clin Lab Diagnost & Pathomorphol Dept, Moscow, Russia
[16] Norwegian Qual Improvement Lab Examinat, Bergen, Norway
[17] Univ Verona, Clin Biochem Sect, Verona, Italy
[18] Latin Amer Confederat Clin Biochem COLABIOCLI, Latin Amer Working Grp Preanalyt Phase WG PRE LAT, Verona, Italy
[19] Kliniken Nordoberpfalz AG, Inst Lab Med, Weiden, Germany
[20] Kliniken Nordoberpfalz AG, Inst Lab Med, Amberg, Germany
[21] Klinikum St Marien, Weiden, Germany
[22] Klinikum St Marien, Amberg, Germany
[23] Odense Univ Hosp, Clin Biochem & Pharmacol, Odense, Denmark
[24] West Hertfordshire Hosp NHS Trust, Operating UK NEQAS Haematol & Transfus, Watford, England
[25] Sarstedt GmbH & Co KG, Numbrecht, Germany
[26] Clin Ctr Serbia, Ctr Med Biochem, Belgrade, Serbia
[27] Univ Leuven, Dept Lab Med, Leuven, Belgium