Mealey's (January 17, 2018, 9:19 AM EST) -- ST. LOUIS — An expert witness for a minor asserting medical malpractice claims cannot offer an opinion that injuries to the minor limit the youth’s ability to stand or walk to “perhaps as much as a maximum of four hours per day” because it is only speculation, though the expert’s other testimony is admissible, a Missouri federal judge ruled Jan. 12 (J.B. v. Missouri Baptist Hospital of Sullivan, et al., No. 4:16-cv-01394, E.D. Mo., 2018 U.S. Dist. LEXIS 5785)....