
Keywords: طبقه بندی بین المللی بیماری ها، نسخه 9; health services research; PHIS; spinal fusion; pediatric; healthcare costs; orthopedics; spine; critical care; AIS; Adolescent idiopathic scoliosis; eβ; Exponentiated coefficients; ICD-9; International Classification of Diseases, 9th edition; ICU; Intens