In the first issue of 2001 we published a paper by Alvarez et al.1 describing a study of subthalamic nucleus lesioning for Parkinson's disease. We invited Dr. Andres Lozano to write an accompanying Editorial however, in error, this piece was not published until the next issue.2 Again in error, Dr. Lozano's editorial was not corrected to indicate that the Alvarez paper had appeared in the previous issue and the citation to this paper was not listed correctly in Dr. Lozano's list of references. We apologize to our readership and to the authors of the papers in question for the confusion.