Serological evidence of an association of a novel Chlamydia, TWAR, with chronic heart disease and acute myocardial infarction - Saikku,P.; Mattila,K.; Nieminen,M.S.; Hutten,J.K.; Leionen,M.; Ekman,M.R.; Makela,P.H.; Valtona,V. (Lancet, 1988)