Peter J. Pronovost, Derek C. Angus, Todd Dorman, Karen A. Robinson, Tony T. Dremsizov, Tammy L. Young,
Physician Staffing Patterns and Clinical Outcomes in Critically Ill Patients: A Systematic Review JAMA. ,vol. 288, pp. 2151- 2162 ,(2002) ,
10.1001/JAMA.288.17.2151