Слова в скобках написать в passive voice

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2. is thought

3. is associated

4. are found

5. is involved

6. are not clearly understood

7. are lowered

8. is decreased

9. is also involved

10. is characterized

11. are precipitated

12. are often relieved

13. are often reported

14. are often labeled

15. is often delayed

16. is usually treated

17. is needed