Frogner_et_al-2018-Health_Services_Research

https://www.researchgate.net/publication/325319327_Physical_Therapy_as_the_First_Point_of_Care_to_Treat_Low_Back_Pain_An_Instrumental_Variables_Approach_to_Estimate_Impact_on_Opioid_Prescription_Health_Care_Utilization_and_Costs