Screening of diabetic patients for microalbuminuria in primary care — The PROSIT-Project - Piehlmeier, W.; Renner, R.; Schramm, W.; Kimmerling, T.; Garbe, S.; Proetzsch, R.; Fahn, J.; Piwernetz, K.; Landgraf, R. (Experimental and Clinical Endocrinology & Diabetes, 1999)