• The causal role of smoking on the risk of headache. A Mendelian randomization analysis in the HUNT Study 

      Johnsen, Marianne Bakke; Winsvold, Bendik K S; Børte, Sigrid; Vie, Gunnhild Åberge; Pedersen, Linda Margareth; Storheim, Kjersti; Skorpen, Frank; Hagen, Knut; Bjørngaard, Johan Håkon; Åsvold, Bjørn Olav; Zwart, John-Anker (Journal article; Peer reviewed, 2018)
      Background and purpose Headache has been associated with various lifestyle and psychosocial factors, one of which is smoking. The aim of the present study was to investigate whether the association between smoking intensity ...