The relationship of acute respiratory illness history to the prevalence and incidence of obstructive lung disorders.Lebowitz, Burrows1977 JunTijdschriftartikel
The Tecumseh study of respiratory illness. X. Relation of acute infections to smoking, lung function and chronic symptoms.Monto, Ross1978 JanTijdschriftartikel
ASA physical status classifications: a study of consistency of ratings.Owens, Felts, Spitznagel1978 OctTijdschriftartikel