The following excerpt is from Zeytuntsyan v. Sullivan, 972 F.2d 1348 (9th Cir. 1991):
20 C.F.R. 416.929. Once the claimant has produced medical evidence of an underlying impairment which is reasonably likely to be the cause of the alleged pain, medical findings are not required to support the alleged severity of pain. Bunnell v. Sullivan, 947 F.2d 341, 345 (9th Cir.1991) (en banc).
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