In medical-malpractice cases involving solely iatrogenic loss (e.g., harm of or relating to medical treatment), the plaintiff bears the burden of proof in establishing that medical negligence was more probably the cause than not the cause of his or her ultimate injury. When an iatrogenic cause combines with an innocent cause, such as an underlying medical condition of the patient, the plaintiffs often pursue a cause of action under the “loss of chance” doctrine and its arguably relaxed burden of proof.That …