[1] Ruhr Univ Bochum, BGFA, D-44789 Bochum, Germany
[2] BIPS, D-28359 Bremen, Germany
[3] Ernst Moritz Arndt Univ Greifswald, D-17487 Greifswald, Germany
[4] Univ Bonn, Med Univ Poliklin Bonn, D-53111 Bonn, Germany
[5] Univ Dusseldorf, IUF, D-40225 Dusseldorf, Germany
[6] Europrote AG, D-16761 Hennigsdorf, Germany
[7] Univ Queensland, Sch Biomed Sci, St Lucia, Qld 4072, Australia
[8] Univ Dortmund, Inst Arbeitsphysiol, IfADo, D-44139 Dortmund, Germany