[1] Univ Turku, Turku, Finland
[2] Turku Univ Hosp, FIN-20520 Turku, Finland
[3] Tampere Univ Hosp, Tampere, Finland
[4] Univ Helsinki, Helsinki, Finland
[5] Univ Helsinki, Cent Hosp, Helsinki, Finland
[6] Univ Eastern Finland, Kuopio, Finland
[7] Oulun Univ Hosp, Oulu, Finland
[8] Univ Oulu, Oulu, Finland