In the published article, there was an error in the Funding statement. The funding contribution of the Italian Ministry of Health was omitted. The corrected Funding statement appears below:
This study was partly supported by grants of the Italian Space Agency (ASI), projects Disorders of Motor and Cardio- Respiratory Control (DMCR) and Osteoporosis and Muscle Atrophy (OSMA), by a grant (PRIN 2007) of the Italian Ministry of University and Research (MIUR), and partially supported by the Italian Ministry of Health.
The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way. The original article has been updated.
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