title: A clinicopathologic study on sick sinus syndrome with histological approach to the sinoatrial node.
mesh_terms: D000328:Adult; D000368:Aged; D001283:Atrioventricular Node / Q000473:pathology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012804:Sick Sinus Syndrome / Q000473:pathology* / Q000503:physiopathology; D012849:Sinoatrial Node / Q000473:pathology* / Q000503:physiopathology