Medication use and comorbidities in an increasingly younger osteoarthritis population: an 18-year retrospective open-cohort study oleh Jerry Hall, Brian J Piper, Haiyan Sun, Edward Casey, Jove Graham, Tonia Novosat, Joseph A Boscarino, Melissa S Kern, Vanessa A Hayduk, Craig Beck, Rebecca L Robinson, Patricia Dorling, Eric Wright