565 N.W.2d 164 LEO W. ZIULKOWSKI, INDIVIDUALLY AND AS THE SPECIAL ADMINISTRATOR OF THE ESTATE OF LEONA F. ZIULKOWSKI, PLAINTIFF, RICHARD A. ZIULKOWSKI AND CYNTHIA L. ZIULKOWSKI, PLAINTIFFS-APPELLANTS,[†] v. DR. GREGORY M. NIERENGARTEN, D.O., PHYSICIANS INSURANCE COMPANY OF WISCONSIN, INC., A WISCONSIN CORPORATION AND PATIENTS COMPENSATION FUND, DEFENDANTS-RESPONDENTS, JOHN DOE, M.D., FRANK DOE, M.D., MARY […]