| UPGRADES & DOWNGRADES HISTORY |
| Date | Research Firm | Action | From | To | | 29-Oct-03 | Leerink Swann | Downgrade | Outperform | Mkt Perform | | 14-Jul-03 | USB Piper Jaffray | Upgrade | Market Perform | Outperform | | 7-Aug-02 | USB Piper Jaffray | Downgrade | Outperform | Market Perform | | 29-Apr-02 | USB Piper Jaffray | Downgrade | Strong Buy | Outperform | | 3-May-00 | USB Piper Jaffray | Initiated | | Strong Buy | | 10-Jan-00 | Salomon Smth Brny | Initiated | | Outperform | | 23-Dec-99 | First Union Sec | Initiated | | Buy | | 14-Jul-98 | Dain Rauscher | Initiated | | Buy | | 5-Jun-98 | Furman Selz | Initiated | | Buy |
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| Current Month | Last Month | Two Months Ago | Three Months Ago | | Strong Buy | | | | | | Buy | | | | | | Hold | | | | | | Underperform | | | | | | Sell | | | | |
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