BY TONY WEST A new kind of health-care provider, unknown to our grandparents, has become an important option for Americans seeking treatment for what ails them. Urgent-care clinics began to form 40 years ago. They spread slowly into the Northeast but have become a basic feature of Philadelphia’s medical landscape in the last 10 years. … Continue reading URGENT CARE ON THE RISE: Quick, Cheap, Convenient, These Clinics Fill a Void