[1] Statens Serum Inst, Copenhagen, Denmark
[2] Austrian Agcy Hlth & Food Safety, Vienna, Austria
[3] Sciensano, Brussels, Belgium
[4] Natl Inst Hlth Dev, Tallinn, Estonia
[5] Finnish Natl Inst Hlth & Welf, Helsinki, Finland
[6] French Publ Hlth Agcy, St Publ France, St Maurice, France
[7] Hellen Ctr Dis Control & Prevent, Athens, Greece
[8] Robert Koch Inst, Berlin, Germany
[9] Hess Landesprufungs & Untersuchungsamt Gesundheit, Dillenburg, Germany
[10] Natl Publ Hlth Inst, Budapest, Hungary
[11] Minist Human Capac, Budapest, Hungary
[12] Hlth Serv Execut Hlth Protect Surveillance Ctr, Dublin, Ireland
[13] Lazio ASL Roma 1, Dipartimento Epidemiol SSR, Rome, Italy
[14] Minist Salute, Rome, Italy
[15] Lab Natl Sante, Luxembourg, Luxembourg
[16] Directorate Hlth Informat & Res, Pieta, Malta
[17] Dept Hlth Regulat, Pieta, Malta
[18] Natl Inst Publ Hlth & Environm RIVM, Bilthoven, Netherlands
[19] Norwegian Inst Publ Hlth, Oslo, Norway
[20] Inst Nacl Saude Doutor Ricardo Jorge, Lisbon, Portugal
[21] Carlos III Hlth Inst, CIBER Epidemiol Salud Publ CIBERESP, Natl Ctr Epidemiol, Madrid, Spain
[22] Publ Hlth Agcy Sweden, Stockholm, Sweden
[23] Fed Stat Off, Neuchatel, Switzerland
[24] Publ Hlth England, Colindale, England
[25] Hlth Protect Scotland, Glasgow, Lanark, Scotland
[26] WHO, Reg Off Europe, Copenhagen, Denmark
[27] European Ctr Dis Prevent & Control, Solna, Sweden
[28] Univ Copenhagen, Fac Hlth & Med Sci, Dept Vet & Anim Sci, Copenhagen, Denmark