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12 in total

1. Randomized, controlled trials, observational studies, and the hierarchy of research designs.

Authors: J Concato; N Shah; R I Horwitz
Journal: N Engl J Med Date: 2000-06-22 Impact factor: 91.245

Authors: K Benson; A J Hartz
Journal: N Engl J Med Date: 2000-06-22 Impact factor: 91.245

Authors: L Cohen; H Rothschild
Journal: Perspect Biol Med Date: 1979 Impact factor: 1.416

Authors: A B Hill
Journal: Control Clin Trials Date: 1990-04

Authors: W D Warren
Journal: Am J Surg Date: 1974-01 Impact factor: 2.565

Authors: A Steinschneider
Journal: Pediatrics Date: 1972-10 Impact factor: 7.124

Authors: M J Solomon; A Laxamana; L Devore; R S McLeod
Journal: Surgery Date: 1994-06 Impact factor: 3.982

Authors: F G Moody
Journal: Am J Surg Date: 1983-01 Impact factor: 2.565

Authors: M J Solomon; R S McLeod
Journal: Surgery Date: 1995-09 Impact factor: 3.982

Authors: M L Cheatham; W C Chapman; S P Key; J L Sawyers
Journal: Ann Surg Date: 1995-05 Impact factor: 12.969

4 in total

Authors: Huug Obertop
Journal: Ann Surg Date: 2005-12 Impact factor: 12.969

Authors: Brij B Agarwal; Kamran Ali; Karan Goyal; Krishan C Mahajan
Journal: Indian J Surg Date: 2012-06-21 Impact factor: 0.656

Authors: Hope T Jackson; Monica T Young; H Alejandro Rodriguez; Andrew S Wright
Journal: Surg Endosc Date: 2018-03-01 Impact factor: 4.584

Authors: L William Traverso
Journal: J Gastrointest Surg Date: 2007-07-25 Impact factor: 3.452

4 in total