title: [Clinical study on retinal vein occlusion. Part 1: The collateral circulation in branch retinal vein occlusion].
mesh_terms: D000328:Adult; D000368:Aged; D003097:Collateral Circulation; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012169:Retinal Vein; D014652:Vascular Diseases / Q000503:physiopathology