Long-term additive prognostic value of thallium-201 myocardial perfusion imaging over clinical and exercise stress test in low to intermediate risk patients: study in 1 137 patients with 6-year follow-up. - Vanzetto,G.; Ormezzano,O.; Fagret,D.; Comet,M.; Denis,B.; Machecourt,J. (Circulation, 1999)