This study was partly sponsored by European Commission
FP6-2004–IST-NMP-2 Project No. 16712
“CyberManS.” I thank Leonard O’Sullivan, Stephan de
la Rosa, Michiel de Looze, Henning Brau, and two independent
reviewers for their helpful comments on
earlier versions of the manuscript. Many thanks go
to Ricardo Jendrusch and Benjamin Illmann for their
support in study preparation and data acquisition.