Erratum
Vol. 65, No. 3, September 1997, Correspondence by Balkin, et al. Pages 372-374: Throughout the Letter all of the words "planter" should be "plantar."
Vol. 66, No. 2, June 1998: In the titles of the three original articles by Schreuder (beginning on pages 149, 159, and 170), the years should read "1987-1995."