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 of included studies by publication year.
| Publication year | Number of studies | Percentage |
|---|---|---|
| 2016 | 4 | 16.7% |
| 2017 | 2 | 8.3% |
| 2018 | 2 | 8.3% |
| 2019 | 2 | 8.3% |
| 2020 | 2 | 8.3% |
| 2021 | 4 | 16.7% |
| 2022 | 1 | 4.2% |
| 2023 | 1 | 4.2% |
| 2024 | 2 | 8.3% |
| 2025 | 3 | 12.5% |
| 2026 | 1 | 4.2% |
| Total | 24 | 100% |
