Study sites that enrolled participants
| COUNTRY | CITY | SITE NAME | SITE ID | PRINCIPAL INVESTIGATOR | |
|---|---|---|---|---|---|
 | Finland | Helsinki | Helsinki University Hospital | #10 | Putaala Jukka |
| Finland | Kuopio | Kuopio University Hospital | #12 | Jäkälä Pekka |
| Finland | Tampere | Tampere University Hospital | #14 | Numminen Heikki |
| Finland | Turku | Turku University Central Hospital | #15 | Roine Risto O. Ylikotila Pauli |
| Finland | Oulu | Oulu University Hospital | #16 | Huhtakangas Juha |
 | Turkey | Istanbul | Istanbul Faculty of Medicine, Istanbul University | #21 | Yesilot Barlas Nilufer |
 | Portugal | Lisbon | Hospital de Santa Maria Centro Hospitalar Lisboa Norte | #22 | Catarina Fonseca |
 | Norway | Bergen | Haukeland Hospital | #23 | Waje-Andreassen Ulrike |
 | Greece | Athens | Attikon University Hospital | #24 | Tsivgoulis Georgios |
 | Sweden | Gothenburg | Sahlgrenska University Hospital | #27 | Redfors Petra |
 | Italy | Reggio Emilia | Arcispedale Santa Maria Nuova IRCCS | #25 | Zedde Marialuisa |
 | Netherlands | Nijmegen | Radboud University Medical Center | #28 | de Leeuw Frank-Erik |
 | Germany | Greifswald | University Medicine Greifswald | #29 | von Sarnowski Bettina |
 | Estonia | Tartu | Tartu University Hospital | #30 | Kõrv Janika |
 | Lithuania | Vilnius | Vilnius University Hospital Santaros Klinikos | #33 | Ryliskiene Kristina |
| Italy | Brescia | Brescia Spedali Civili | #26 | Pezzini Alessandro |
 | UK | Stoke-on-Trent | Royal Stoke University Hospital | #34 | Ferdinand Phillip |
| UK | Peterborough | Peterborough City Hospital | #35 | Licenik Radim |
 | Spain | Almería | Torrecárdenas University Hospital | #40 | Martínez Sánchez Patricia |