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From a writer with a face as red as an autumn apple to Dr Adams, Dr Howe, and the 50 some other readers who wrote to point out my misperception: thanks. You are absolutely correct, and I am pleased it is a sled, not a crutch.
M. Therese Southgate. Crutch Is Sled and Nothing's Twisted in The Cider Mill-Reply. JAMA. 1991;265(2):214. doi:10.1001/jama.1991.03460020067027