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William D. Hibbetts has served as our Senior Vice President, Chief Financial Officer and Secretary since December 2003, and he served as one of our directors from June 1984 to May 2004. He previously served as our Senior Vice President, Chief Accounting Officer and Secretary from May 2002 to December 2003 and served as our Vice President, Chief Accounting Officer and Secretary from December 2000 to May 2002. Mr. Hibbetts served as the Chief Financial Officer of International Cancer Screening Laboratories from March 2000 to December 2000. He worked as a consultant from June 1999 to March 2000. He served as the Chief Accounting Officer of Southwest Venture Management Company from July 1988 to May 1999. Mr. Hibbetts was the Treasurer/Controller of Gary Pools, Inc. from May 1986 to July 1988. He previously served as an officer of our company from January 1982 until May 1986. Before initially joining our company, Mr. Hibbetts served in various positions as an accountant with KPMG Peat Marwick LLP from June 1971 to December 1981, including as an audit manager from July 1978 to December 1981. | 