Usage of antimicrobials on 60 dairy farms in Northern Germany and characterization of methicillin resistant staphylococcus aureus MRSA and extended spectrum beta lactamases producing Escherichia coli ESBLs producing E. coli isolated from bulk tank milk samples [Dr. med. vet.] - Kreausukon, K (Freie Universität Berlin, Fachbereich Veterinärmedizin, 2011)