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Four blocks of a standardized protocol were applied. The first block was only used to allow familiarization and habituation and was discarded. Then this habituation block was followed by block PRE. During the MAIN block a tonic counterirritation-pain (knee-pain induced by knee stress) was applied concurrently with the 60 phasic pain stimuli. This counterirritation was released and pain had disappeared before the POST block started.
