1 Department of Clinical Pharmacy and Pharmacology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands k.p.j.smits@umcg.nl.
2 Department of Clinical Pharmacy and Pharmacology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands.
3 Department of Nephrology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands.
4 Dutch College of General Practitioners, Utrecht, the Netherlands.
5 Dutch Institute for Rational Use of Medicine (IVM), Utrecht, the Netherlands.
6 Diabetes Centre, Isala Clinics, Zwolle, the Netherlands.