Lee G, Yoon T, Lee Y, Kim K, Yi C.  Effects of Lower Rib Expansion Limitation on Maximal Respiratory Pressure and Abdominal Muscle Activity During Maximal Breathing in Healthy Subjects.  J Kor Phys Ther 2020;32:394-399.  https://doi.org/10.18857/jkpt.2020.32.6.394