MARIETTA — Life University plans to open a new chiropractic and health care clinic for low-income residents next month in east Marietta.The new location, at 1323 Roswell Road, is right off Interstate 75. A soft opening is scheduled for Dec. 17. Dr. Steve Mirtschink, director of the Community Outreach Chiropractic Clinic, said he and the clinic’s staff are more than ready to move into the new space, which Life spent about $200,000 renovating.