Since case control studies don't track patients over time, they can't establish relative risk.

Timmy Global Health now creates patient histories to track patients over time.

Both of these organizations encourage physicians to track patients and reports.

They also track patients with chronic illnesses like diabetes and asthma.

The new study grew out of these observations and hypotheses and was designed to track patients as they went through procedures to clear their arteries.

Typically, the cameras will track patients and their families for six to nine months.

Medical researchers, hospitals, oncology programs all need to track former patients and study subjects.

But there is no national system to track such patients, they say, no central database like that which exists for other diseases.

They are used to identify patients in a hospital, helping doctors and nurses track patients and their medical history.

Most of the studies tracked patients for up to two or three weeks after treatment.