Prevalence of infant colic.
D000367:Age Factors; D003085:Colic / Q000453:epidemiology*; D004739:England; D006801:Humans; D007223:Infant; D007227:Infant Nutritional Physiological Phenomena; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000453:epidemiology*; D012923:Social Class; D013997:Time Factors