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TRUE:

The Ellis-van Creveld syndrome most commonly occurs in the Amish of Lancaster, Pa. but is not isolated to this group, with the incidence being approximately 5 or more per 1000 live births and 2 per 1000 living persons. The disorder has also been described occurring in English, Dutch, Jewish, Turkish, French-Canadian and a few other persons. No case had been described in the Amish of Ohio, Indiana, or other Amish areas at the time of an extensive search performed by McKusick, et al.