[1] Finnish Inst Hlth & Welf, Helsinki, Finland
[2] Univ Jyvaskyla, Jyvaskyla, Finland
[3] Univ Eastern Finland, Kuopio, Finland
[4] Rigshosp, Copenhagen, Denmark
[5] Univ Leipzig, LIFE, Leipzig, Germany
[6] Univ Leipzig, Leipzig, Germany
[7] German Environm Agcy, Berlin, Germany
[8] UK Hlth Secur Agcy, Oxford, Oxon, England
[9] Fraunhofer Inst Biomed Engn, Sulzbach, Germany