@phdthesis{Kleffel2018,
  author      = {Sonja Beate Kleffel},
  title       = {The role of cancer cell-expressed PD-1 in tumorigenesis and tumor immune evasion},
  type        = {doctoralthesis},
  school      = {Universit{\"a}t W{\"u}rzburg},
  year        = {2018},
}