Sporadic community-acquired Legionnaires' disease in the United States. A case-control study. - Storch G; Baine WB; Fraser DW; Broome CV; Clegg HW 2nd; Cohen ML; Goings SA; Politi BD; Terranova WA; Tsai TF; Plikaytis BD; Shepard CC; et al. (Annals of internal medicine, 1979)