1. Lahey Clinic, Burlington, Massachusetts
2. INSERM U914, Hôpital de Bicêtre, Faculté de Médicine Paris-Sud, Université Paris XI, K.-Bicêtre, France
3. Massachusetts General Hospital, Boston, Massachusetts
4. Service of Microbiology, University Hospital Marqués de Valdecilla, Santander, Spain
5. Department of Microbiology, University of Seville-University Hospital Virgen Macarena, Seville, Spain
6. Institute of Antibiotics, Huashan Hospital, Fudan University, Shanghai, People's Republic of China