Petition by defendant (Mecklenburg County) for discretionary review pursuant to G.S. 7A-31 denied 4 March 1992. Petition by defendants (Henry and Scott) for discretionary review pursuant to G.S. 7A-31 denied 4 March 1992. Petition by defendants (Bird, Charlotte Radiology Group and Providence Radiology Associates) for discretionary review pursuant to G.S. 7A-31 denied 4 March 1992.