| (a) The aggregate percentage of Common Stock reported owned beneficially by Dr. Scott is based upon 29,007,564 shares outstanding as of December 31, 2010. Dr. Scott beneficially owned 1,812,410 shares of Common Stock as of December 31, 2010, constituting approximately 6.2% of the shares of Common Stock outstanding. The 1,812,410 shares of Common Stock included 1,646,646 shares owned directly by Dr. Scott, 12,298 shares indirectly held through Morgan Stanley DW Inc. as Custodian for Randal W. Scott, IRA, 3,466 shares held for the benefit of Dr. Scott’s children, of which Dr. Scott’s sister is trustee, and options to purchase 150,000 shares of Common Stock that were subject to outstanding options, 95,418 of which were exercisable within 60 days of December 31, 2010 and 54,582 of which continued to vest in accordance with the vesting terms described in I tem 6. below as Dr. Scott continues as an employee with the Company. (b) Dr. Scott has sole power to vote or to direct the vote and to dispose or to direct the disposition of 1,812,410 shares of Common Stock. (c) On January 10, 2011, Dr. Scott sold 10,000 shares of Common Stock at an average price of $21.7502 per share. On January 11, 2011, Dr. Scott sold 10,000 shares of Common Stock at an average price of $21.7091 per share. These sales were made pursuant to a sales plan in accordance with Rule 10b5-1 of the Securities Exchange Act of 1934, adopted by Dr. Scott on August 7, 2009, that provided for the sale of up to 240,000 shares of the Company’s Common Stock. On February 10, 2011, Dr. Scott sold 10,000 shares of Common Stock at an average price of $22.1223 per share. On February 11, 2011, Dr. Scott sold 10,000 shares of Common Stock at an average price of $22.2820 per share. These sales were made pursuant to a sales plan in accordance with Rule 10b5-1 of the Securities Exchange Act of 1934, adopted by Dr. Scott on August 6, 2010, that provides for the sa le of up to 240,000 shares of the Company’s Common Stock. Subsequent to December 31, 2010, Dr. Scott vested with respect to options to purchase an additional 12,918 shares of Common Stock. (d) Not applicable (e) Not applicable |