[1] Polytech Univ MIlan, Dept Bioengn, I-20133 Milan, Italy
[2] Harvard Univ, Beth Israel Deaconess Med Ctr, Sch Med, Margret & H A Rey Inst Nonlinear Dynam Med, Boston, MA 02215 USA
[3] Univ Tokyo, Grad Sch Educ, Educ Physiol Lab, Tokyo 1940292, Japan