A respirаtоry therаpist is reviewing the plаn оf care fоr a patient diagnosed with cystic fibrosis. The patient uses an albuterol HFA as needed, inhales nebulized 7% NaCl- 2 times daily, and uses an HFCWO vest 3 times daily. The patient was hospitalized 3 times in the past year due to pneumonia. Which of the following should the therapist recommend be added to the care plan for the patient?