| UPGRADES & DOWNGRADES HISTORY |
| Date | Research Firm | Action | From | To | | 16-Oct-09 | Needham | Upgrade | Hold | Buy | | 25-Sep-09 | Needham | Initiated | | Hold | | 4-Aug-09 | Ladenburg Thalmann | Initiated | | Buy | | 20-Sep-07 | Leerink Swann | Initiated | | Outperform | | 23-May-06 | CIBC Wrld Mkts | Initiated | | Sector Outperform | | 22-May-06 | Deutsche Securities | Initiated | | Buy | | 22-May-06 | Pacific Growth Equities | Initiated | | Buy | | 22-May-06 | Lazard Capital | Initiated | | Buy |
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| Current Month | Last Month | Two Months Ago | Three Months Ago | | Strong Buy | 4 | 4 | 4 | 5 | | Buy | 2 | 0 | 0 | 0 | | Hold | 1 | 1 | 1 | 1 | | Underperform | 0 | 0 | 0 | 0 | | Sell | 0 | 0 | 0 | 0 |
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