Erratum

In the October 2002 issue, the Journal published a letter entitled “Increased Rate of Twins among Affected Sib Pairs,” by Peter Visscher (71:995-996), and a response to this letter by Hodge et al. (71:996). The Hodge et al. response discussed, among other things, an error in a formula in Dr. Visscher's letter. This error was corrected in Dr. Visscher's letter before publication, but, because of an oversight by the Journal, Hodge et al. were not given an opportunity to alter their response accordingly. The Journal regrets this error.