The grouping of extending and flexing muscles is examined medically.
McMaster University, Faculty of Health Sciences, Learning Resources, 1200 Main St. W., No. HSC 1M2, Hamilton, ON L8N 3Z5 Canada, Phone: (905)525-9140, Fax: (905)524-5422, Email: firstname.lastname@example.org, URL: http://www.fhs.mcmaster.ca/lro/
Running time 18 minutes.
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