Lectura crítica del estudio "Prescripción de opioides de acción prolongada y mortalidad en pacientes con dolor crónico no oncológico" / Critical appraisal of "Prescription of long-acting opioids and mortality in patients with chronic nonmalignant pain"

These remarks represent a critical appraisal of the article by Ray et al. The approach is based on the reading questions for cohort studies developed by the CASPe (Critical Appraisal Skills Programme Spanish) group discussed in the text and an analysis of the authors' methodological strategies and analytical techniques.