This is the 3104th most frequent Russian word.
клинической
"Clinical."
In this context, 'клинической' modifies 'лаборатории' (laboratory), specifying that the laboratory is associated with clinical research or medical practice.
Она работает в клинической лаборатории.
She works in a clinical laboratory.
The use of 'клинической' here is to denote that the hospital is related to clinical studies or healthcare, modifying 'больницы' (hospital).
Мы посетили клинической больницы отделение.
We visited a department of a clinical hospital.
Here, 'клинической' describes 'статьи' (article) and indicates that the article is related to clinical studies or medicine.