A large-scale free mobile medical clinic that treated more than 6,300 uninsured and underinsured people last summer is scheduled to return to the Los Angeles area in April, volunteers and lawmakers said. Remote Area Medical, or RAM, a Tennessee-based nonprofit group, plans to hold a clinic at the Los Angeles Sports Arena from April 27 to May 3. Last August, the group's eight-day clinic attracted 3,827 volunteers, including dentists, doctors, and other healthcare workers who provided more than $2.8 million in services at the Forum in Los Angeles.