Has anyone ever done research using the theory of Elisabeth Kubler Ross or living-dying interval of E Mansell Pattison?

I've been looking for the answer by reading a book on death and dying Elisabeth Kubler-Ross'; journal with the title "alternatives to the stages model of dying process" - Tillman Rodabough; An empirical Examination of the stage theory of grief - Yale University; article Sceptic Magazine with the title The myth of stages of dying, death and grief; papers of Brian A Wong with the title The impact of the So Called Stage of Grief.