A comparison of the cost-effectiveness of three approaches to screen for sight-threatening diabetic retinopathy. - Porta,M.; Rizzitiello,A.; Tomalino,M.; Trento,M.; Passera,P.; Minnone,A.; Pomero,F.; Gamba,S.; Castellazzi,R.; Montanaro,M.; Sivieri,R.; Orsi,R.; et al. (Diabetes and Metabolism, 1999)