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An 32-year-old patient with muscle pain and stiffness in the chest and neck was examined. A biopsy of biceps sinister was performed. Electronmicroscopy analysis revealed no changes in the structure of myofibrils and a small amount of connective tissue. Abnormal myelin within the intramuscular nerves (myelin foldings) were observed.
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Operational Program Digital Poland, 2014-2020, Measure 2.3: Digital accessibility and usefulness of public sector information; funds from the European Regional Development Fund and national co-financing from the state budget.