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APA Citation
Frieling, T., Berges, W., Borchard, F., Lübke, H. J., Enck, P., & Wienbeck, M. (1988). family occurrence of achalasia and diffuse spasm of the oesophagus.. Gut, 29(11), 1595–1602. http://access.bl.uk/ark:/81055/vdc_100135548334.0x00004b