Hypertension prevalence and blood pressure levels in 6 European countries, Canada, and the United States. - Wolf-Maier,K.; Cooper,R.S.; Banegas,J.R.; Giampaoli,S.; Hense,H.W.; Joffres,M.; Kastarinen,M.; Poulter,N.; Primatesta,P.; Rodriguez-Artalejo,F.; Stegmayr,B.; Thamm,M.; et al. (JAMA, 2003)