Authors: Marta Ebbing; Kaare Harald Bønaa; Ottar Nygård; Egil Arnesen; Per Magne Ueland; Jan Erik Nordrehaug; Knut Rasmussen; Inger Njølstad; Helga Refsum; Dennis W Nilsen; Aage Tverdal; Klaus Meyer; Stein Emil Vollset Journal: JAMA Date: 2009-11-18 Impact factor: 56.272