AU  - Hoppe, Daniel J.
AU  - Schemitsch, Emil H.
AU  - Morshed, Saam
AU  - TornettaIII, Paul
AU  - Bhandari, Mohit
TI  - Hierarchy of Evidence: Where Observational Studies Fit in and Why We Need Them
PT  - JOUR
DP  - 2009
TA  - The Journal of Bone & Joint Surgery
PG  - 2-9
VI  - 91
IP  - Supplement_3
AID  - 10.2106/JBJS.H.01571 [doi]
4100  - http://dx.doi.org/10.2106/JBJS.H.01571
SO  - The Journal of Bone & Joint Surgery May 1, 2009 91(Supplement_3):2