Original article
A Case–Control Study Based on Insurance Claims Data
Dtsch Arztebl Int 2016; 113: 791-8. DOI: 10.3238/arztebl.2016.0791
Freytag, A;
Biermann, J;
Ochs, A;
Lux, G;
Lehmann, T;
Ziegler, J;
Schulz, S;
Wensing, M;
Wasem, J;
Gensichen, J
