Adult 1 Article 1 Cognition 1 Cohort Studies 1 Humans 1 Male 1 Memory, Short-Term 1 Tramadol 1 Wechsler Adult Intelligence Scale 1 Wechsler Memory Scale-Revised Wechsler Scales 1 Wechsler adult intelligence scale 1 Wechsler intelligence scale 1 Wechsler memory scale 1 abstinence 1 adult 1 cognition 1 cognitive defect 1 cohort analysis 1 controlled study 1 hospital patient 1 human 1 intelligence quotient 1 knowledge 1 major clinical study 1 male 1 patient assessment 1 prospective study 1 short term memory 1 task performance 1