title: After-hours telephone calls.
authors: Edward A
authors: EA
authors: Nichols
mesh_terms: D004630:Emergencies; D006801:Humans; D010372:Pediatrics / Q000706:statistics & numerical data; D012017:Referral and Consultation / Q000706:statistics & numerical data*; D013689:Telephone; D013997:Time Factors; D014505:Urban Population