Question: Is this describing a (1) directly correlative relationship, (2) conditionally causative relationship, (3) causative relationship, or (0) no relationship.

Unique identifiers: NCT01507831, NCT01623115, NCT01709500, NCT01617655, NCT01644175, NCT01644188, NCT01644474, NCT01730040, NCT01730053, and NCT01709513.
user
This is a directly correlative relationship
assistant