Table 4.
Top 10 most frequently occurring institutions from the periods of 1997–2002, 2003–2007, 2008–2012, and 2013–2017
| Institution | Count | Institution | Count |
|---|---|---|---|
| Univ Calif San Francisco | 10 | Univ Toronto | 43 |
| Univ Genoa | 10 | Univ Alberta | 31 |
| Hosp Univ Canarias | 9 | Univ Amsterdam | 29 |
| McMaster Univ | 8 | Univ Calif San Francisco | 27 |
| Univ Birmingham | 7 | McMaster Univ | 23 |
| Johns Hopkins Univ | 6 | Johns Hopkins Univ | 18 |
| Off Naval Res | 6 | Taipei Med Univ | 18 |
| Royal Sch Lib & Informat Sci | 6 | Tufts Univ | 18 |
| Inst Sci Informat | 5 | Harvard Univ | 16 |
| Univ Bologna | 5 | Leiden Univ | 16 |
| Univ Toronto | 155 | China Med Univ | 397 |
| Mayo Clin | 143 | Sichuan Univ | 384 |
| Leiden Univ | 99 | Zhejiang Univ | 376 |
| Univ Alberta | 96 | Nanjing Med Univ | 367 |
| Univ Tehran Med Sd | 95 | Univ Toronto | 328 |
| Harvard Univ | 88 | Mayo Clin | 326 |
| Sichuan Univ | 84 | Univ Tehran Med Sci | 291 |
| McMaster Univ | 78 | Sun Yat Sen Univ | 255 |
| Fudan Univ | 76 | Fudan Univ | 245 |
| Univ Amsterdam | 75 | Huazhong Univ Sci & Technol | 244 |