Authors: J F Fries; C E Koop; C E Beadle; P P Cooper; M J England; R F Greaves; J J Sokolov; D Wright Journal: N Engl J Med Date: 1993-07-29 Impact factor: 91.245
Authors: E H Wagner; A Z LaCroix; L Grothaus; S G Leveille; J A Hecht; K Artz; K Odle; D M Buchner Journal: Am J Public Health Date: 1994-11 Impact factor: 9.308