Table 1 Sources of information utilized in the data collection
| Â | United States of America | United Kingdom | Spain | Total |
|---|---|---|---|---|
Review of published literature using Embase | ||||
 Embase search yield | 1252 | 834 | 117 | 2203 |
 Selected articles | 86 | 33 | 23 | 192 |
Manual search of official sources | ||||
 Health authority reports | 23 | 14 | 18 | 55 |
Complementary search of grey literature | ||||
 Healthcare professional & lay public communication material | 22 | 16 | 17 | 55 |
 Market reports | 2 | 1 | 3 | 6 |
 Others | 0 | 1 | 0 | 1 |