Achoo! This time of year, colds and flu knock many of us off our feet. And while many seasonal illnesses are only treatable with rest and chicken soup, sometimes a call to the doctor is in order. The most important way to ensure you get high-quality health care when you need it is to establish a relationship with a good primary care physician. Checkbook.org features ratings of local primary care doctors, along with tips on how to “check-up” on any doctor, and how to know when it may be time to find a new physician.