Table 1.
HSs included in this study and the year of establishment
| Year | 1990's | 2001 | 2002 | 2003 | 2004 | 2005 | Total |
|---|---|---|---|---|---|---|---|
| Number of HS | 2 | 1 | 3 | 5 | 8 | 7 | 26 |
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