Reference 2

Level I Good quality evidence Systematic review of RCTs with
consistent findings
High quality individual RCT
Level II Limited quality patient
orientated evidence
Systematic review of lower quality
studies or studies with inconsistent
findings
Low quality clinical trial
Cohort studies
Case-control studies
Level III Other Consensus guidelines, extrapolations
from bench research, usual practice,
opinion, disease-oriented evidence
(intermediate or physiologic outcomes
only), or case series

[2] Empiric parenteral antibiotic therapy (S. aureus infection): Chong YP, Moon SM, Bang KM, Park HJ, Park SY, Kim MN, Park KH, Kim SH, Lee SO, Choi SH, Jeong JY, Woo JH, Kim YS. Treatment duration for uncomplicated Staphylococcus aureus bacteremia to prevent relapse: analysis of a prospective observational cohort study. Antimicrob Agents Chemother. 2013 Mar;57(3):1150-6. http://www.ncbi.nlm.nih.gov/pubmed/23254436

Empiric parenteral antibiotic therapy (S. aureus infection): Liu C, Bayer A, Cosgrove SE, Daum RS, Fridkin SK, Gorwitz RJ, Kaplan SL, Karchmer AW, Levine DP, Murray BE, J Rybak M, Talan DA, Chambers HF; Infectious Diseases Society of America. Clinical practice guidelines by the infectious diseases society of america for the treatment of methicillin-resistant Staphylococcus aureus infections in adults and children. Clin Infect Dis. 2011 Feb 1;52(3):e18-55. http://www.ncbi.nlm.nih.gov/pubmed/21208910