Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Distribution pattern of the type of articles
| Type of article | Number | Percentage |
|---|---|---|
| Randomised controlled trial | 1 | 0.3 |
| Systematic review | 10 | 2.7 |
| Retrospective study (cohort, comparative, others) | 65 | 17.3 |
| Cross sectional study | 2 | 0.5 |
| Prognostic study | 7 | 1.9 |
| Prospective study (cohort, comparative, others) | 8 | 2.1 |
| Questionnaire | 36 | 9.6 |
| Letter to Editor | 23 | 6.1 |
| Case series/report | 17 | 4.5 |
| Guidelines | 14 | 3.7 |
| Expert opinion | 139 | 37.1 |
| Narrative review | 49 | 13.1 |
| Corrections | 4 | 1.1 |
| Total | 375 | 100 |
