M. Tish Knobf on Nurse-Patient Communication BarriersByM. Tish Knobf, PhD, RN, FAAN, AOCNFebruary 5th 2013M. Tish Knobf, PhD, RN, FAAN, AOCN, from the Yale University School of Nursing, discusses communication barriers that nurses face when providing cancer patients with information regarding treatment and side effects.