Nonetheless, there are also caveats regarding the interpretation of Sami health studies: i) The investigation of Sami public health maybe hampered due to low participation rate in some communities , ii) public health surveys might not reach all individuals who might be defined as Sami descendants, because a person has to self-identify as Sami. In particular the North-South migration wave as a result of the burned earth politics of the retreating German troops in World War II known as the “burning of Finnmark”, has scattered people of Sami heritage over the whole of Norway. Many of those who came as refugees to the south decided to not identify themselves as Sami [21,28–30,45–49]. As a consequence, persons of Sami descend are possibly living everywhere in Norway even though they are not aware of it.