New Orleans Medical centers devastated by Hurricane Katrina's floodwaters remain closed, with the number of beds available to the sick in cut in half. But a house in the city is open for business, dispensing free health care to anyone in need. The clinic is part of healthcare delivery in post-Katrina New Orleans, where clinics have cropped up in corner groceries and old department stores, and Good Samaritans are stepping in to help.