Assessment of Initial Depressive State and Pain Relief With Ketamine in Patients With Chronic Refractory Pain – PMC
— Read on www.ncbi.nlm.nih.gov/pmc/articles/PMC10199354/

Ketamine for refractory chronic pain: a 1-year follow-up stu… : PAIN
— Read on journals.lww.com/pain/Fulltext/2022/04000/Ketamine_for_refractory_chronic_pain__a_1_year.8.aspx