THE EFFECT OF OPRM1, ABCB1, IL1B, PTGS2, LOC 541472 GENE POLYMORPHISM ON THE VARIABILITY OF CHRONIC PAIN SYNDROME IN PATIENTS WITH PANCREATIC CANCER ArticleBobrova Olga, Schnider Natalya, Zyryanov Sergey, Dmitrenko Diana, Zobova Svetlana, Zukov RuslanКачественная клиническая практика. 2019. С. 53-59