Is there an accessory sphincter of the cervical oesophagus?

Ekberg O, Borgström P, Lindgren S

Department of Diagnostic Radiology, Malmö General Hospital, Sweden.

Br J Radiol. 1988 Apr;61(724):341-3. doi: 10.1259/0007-1285-61-724-341.

Abstract

摘要

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