A study of illness in a group of Cleveland families.  XII.  The association of respiratory and gastrointestinal symptoms; an estimation of the magnitude and time relations of the association.
D005767:Gastrointestinal Diseases / Q000453:epidemiology*; D006801:Humans; D012044:Regression Analysis; D012137:Respiratory System; D012140:Respiratory Tract Diseases
GASTROINTESTINAL DISEASES/epidemiology; RESPIRATORY TRACT/diseases