THE INTERVENTION OF MICROWAVE DIATHERMY AND SLOW STROKE BACK MASSAGE IS MORE EFFECTIVE THAN MICROWAVE DIATHERMY AND WILLIAM FLEXION EXERCISE TO IMPROVE FUNCTIONAL ABILITY IN INDIVIDUAL WITH MYOGENIC LOW BACK PAIN - Juniantari, Ni Komang Ayu (Bachelor of Physiotherapy and Physiotherapy Profession Study Program, Faculty of Medicine, Udayana University in collaboration with Indonesian Physiotherapy Association (IPA), 2018)