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Collection of samples from July 2020 to October 2022.
| Year of Sampling | 2020 | 2020 | 2021 | 2022 |
|---|---|---|---|---|
| July August | September October | July August | July August | |
| Serum (V) | 10 | 22 | 12 | 12 |
| Serum (K) | 8 | 10 | 1 | 10 |
| Serum (L) | 1 | 10 | 4 | 8 |
| Saliva | / | 18 | 11 | / |
| Hair | 10 | 21 | 12 | / |
| Faeces | 19 | 19 | 5 | / |
| Urine | / | / | 6 | / |
| Tears | / | / | / | 2 |
