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Graff LG, Robinson D (February 2001). "Abdominal pain and emergency department evaluation". Emergency Medicine Clinics of North America. 19 (1): 123–36. doi:10.1016/S0733-8627(05)70171-1. PMID11214394.
Ackermann RJ, Kemle KA, Vogel RL, Griffin RC (June 1998). "Emergency department use by nursing home residents". Annals of Emergency Medicine. 31 (6): 749–57. doi:10.1016/S0196-0644(98)70235-5. PMID9624316.