Add new study: Searson_2004

[ehwenk]

• no attempt to contact author, since dataset 19 years old
• data transcribed from tables and extracted from figures in manuscript

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (dd19033) 80.20% compared to head (8f395eb) 80.20%.

:exclamation: Current head 8f395eb differs from pull request most recent head 7309d23. Consider uploading reports for the commit 7309d23 to get more accurate results

:exclamation: Your organization is not using the GitHub App Integration. As a result you may experience degraded service beginning May 15th. Please install the Github App Integration for your organization. Read more.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #707 +/- ## ======================================== Coverage 80.20% 80.20% ======================================== Files 7 7 Lines 1531 1531 ======================================== Hits 1228 1228 Misses 303 303 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Do you have feedback about the report comment? Let us know in this issue.