Frequency of the different drug-eluting stent (DES) used over time (2008–2014) according to active drug component and carrier material (groups >1% only). Frequency of the different drug-eluting stent (DES) used over time (2008–2014) according to active drug component and carrier material (groups >1% only). Multiple selections were possible due to implantation of different stent types during index procedure. Bio-resorbable vascular scaffolds were not included. OPS ‘Operationen- und Prozedurenschlüssel’ (OPS) German version of the International Classification of Procedures in Medicine.19 Elke Jeschke et al. BMJ Open 2017;7:e017460 ©2017 by British Medical Journal Publishing Group