Serum homocysteine level and protein intake are related to risk of microalbuminuria: the Hoorn Study. - Hoogeveen,E.K.; Kostense,P.J.; Jager,A.; Heine,R.J.; Jakobs,C.; Bouter,L.M.; Donker,A.J.; Stehouwer,C.D. (Kidney Int, 1998)