Before revision:  In this study , we explore the Massachusetts All Payer Claim Data(MA APCD) , a de-identified healthcare claim dataset, and propose a novel framework to examine how na\"ive users develop opioid use disorder.
After revision:  In this study , we explore the Massachusetts All Payer Claim Data(MA APCD) , a de-identified healthcare claim dataset, and proposes a machine learning framework to examine how na\"ive users develop opioid use disorder.