title: Tools & Techniques: CTO--the retrograde approach.
authors.affiliation: AHEPA University Hospital, Department of Cardiology, Thessaloniki, Greece. gsianos@auth.gr
authors.forename: Georgios
authors.initials: G
authors.lastname: Sianos
authors.forename: Angelos
authors.initials: A
authors.lastname: Karlas
mesh_terms: D015906:Angioplasty, Balloon, Coronary / Q000379:methods*; D006328:Cardiac Catheterization; D002908:Chronic Disease; D003097:Collateral Circulation; D054059:Coronary Occlusion / Q000628:therapy*; D006801:Humans