Table 2.
Search strategy for gray literature
| Database/ Search Engine | Search String: | Hits | Relevanta | Includedb |
| “health 2.0” OR “health2.0” OR “health20” | 482000 | 28 | 13 | |
| “medicine 2.0” OR “medicine2.0” OR “medicine20” | 155000 | 24 | 16 | |
| “what is health 2.0” OR “what is health 2.0” OR “what is health20” | 99 | 29 | 25 | |
| “what is medicine 2.0” OR “what is Medicine 2.0” OR “what is medicine 20” | 33 | 14 | 14 | |
| Bing | “health 2.0” OR “health2.0” OR “health20” | 328000 | 4 | 4 |
| “medicine 2.0” OR “medicine2.0” OR “medicine20” | 62300 | 8 | 6 | |
| “what is health 2.0” OR “what is health 2.0” OR “what is health20” | 477 | 26 | 24 | |
| “what is medicine 2.0” OR “what is medicine 2.0” OR “what is medicine 20” | 31 | 12 | 11 | |
| Yahoo | “health 2.0” OR “health2.0” OR “health20” | 466000 | 17 | 9 |
| “medicine 2.0” OR “medicine2.0” OR “medicine20” | 45000 | 19 | 14 | |
| “what is health 2.0” OR “what is health 2.0” OR “what is health20” | 583 | 21 | 21 | |
| “what is medicine 2.0” OR “what is medicine 2.0” OR “what is medicine 20” | 121 | 14 | 12 | |
| Mednar | “health 2.0” OR “health2.0” OR “health20” | 329 | 27 | 10 |
| “medicine 2.0” OR “medicine2.0” OR “medicine20” | 12 | 13 | 5 | |
| Scopus | TITLE-ABS-KEY(“what is health 2.0”) OR TITLE- ABS-KEY(“what is health2.0”) OR TITLE-ABS-KEY(“what is health20”) | 23 | 3 | 0 |
| TITLE-ABS-KEY(“what is medicine 2.0”) OR TITLE- ABS-KEY(“what is medicine2.0”) OR TITLE-ABS-KEY(“what is medicine20”) | 0 | 0 | 0 | |
| Subtotal | 1540008 | 262 | 184 | |
| Duplicates | 149 | |||
| Total | 35 |
a Relevant: number of relevant articles based on title, abstract, and keywords in first 100 results
b Included: number of included articles based on full article