Retail health clinics, also known as convenient-care clinics, are a recent development, referring to healthcare facilities usually located within a variety of retail stores, including pharmacies and supermarkets. They're designed to offer primary care at hours that often exceed the typical doctor's office and without the need for an appointment. The clinics handle a limited range of urgent-care needs and are usually staffed by nurse practitioners or physician assistants. As the name implies, a key attraction for these facilities is the convenience of time and location. At the same time, critics often question the quality of care provided and note potential difficulties involving follow-up care with a patient's family physician. The American Academy of Family Physicians last year withdrew its conditional endorsements of such clinics after some started offering disease-management services.