EXHIBIT 23.8 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the use in this Post-Effective Amendment No. 2 to the registration statement of our report dated February 25, 2000 included herein and to all references to our Firm included in this Post-Effective Amendment No. 2 to the registration statement. /s/ ARTHUR ANDERSEN LLP Boston, Massachusetts December 13, 2000