| Researcher | Number of reported issues |
| Ruth, Hadass, Ron & Rami | 2 |
| Geoffrey, Jeffrey & Paul | 1 |
| Seth | 1 |
| Merel, Joke, Nore, Lieven & Bert | 1 |
| David & North | 4 |
| Marc | 2 |
| Rachel | 3 |
| Paul, George, Marianne & Steve | 2 |
| Sean, Demetra, Erin, Anne & Rosalia | 1 |
| Jill, Emily & Britanny | 3 |
| Janet & Daniel | 3 |
| Jane & Daniel | 1 |