1. From Helsinki University Central Hospital, Department of Medicine, Division of Cardiology (J.S., H.V.-M., M.S.N.), and Infectious Diseases (K.M., V.V.), Helsinki; Lahti Central Hospital (O.A.), Lahti; Kajaani Central Hospital (J.J.), Kajaani; and Jyväskylä Central Hospital (J.M.), Jyväskylä, Finland.