In a medical malpractice suit arising from a surgery performed by defendant-doctor, summary judgment for defendant is reversed based on defendant's failure to meet the burden of producing evidence where: 1) a medical expert witness based his opinions on facts derived from a review of hospital and medical records which were not properly admitted into evidence under the business records exception to the hearsay rule; and 2) thereby, there were no facts before the court on which the expert medical witness could rely to form his opinion.