Author Contributions:
Study concept and design: MK
Acquisition of data: MAC, ÖK, EGK
Analysis and interpretation of data: MK, AMA
Drafting of the manuscript: AMA, TE, FÖ, VR
Critical revision of the manuscript for important intellectual content: LÖ, MK, BK
Approval of final manuscript: MK, AMA, ÖK, MAC, TE, VR, EGK, FÖ, BK, LÖ