But as the Doctor investigates further, he uncovers an experiment years in the making.

The doctor investigated the room with Barnabas, but the two witnessed nothing unusual.

Before surgery, the patient's blood pressure dropped, and there was no indication that doctors had investigated the cause of the drop.

In this film, a doctor and a nursing student investigate the mysterious disappearances taking place at their hospital.

By January, local doctors were investigating what they believed was a new kind of "atypical pneumonia."

The Doctor investigates the bomb, which is the cylinder he was chasing at the beginning of the last episode.

The Doctor and Ace investigate the circle, only to find themselves transported to another world.

Communication is key Press your doctor to investigate the full range of therapies, and if she or he lacks experience, find a headache specialist.

The Doctor investigates mysterious goings on at a beauty salon.

Using school nurses to carry out their survey, the doctors investigated almost all the 41 primary and secondary state schools in their health district.