The association between areas of secondary hyperalgesia and volumes of the caudate nuclei and other pain relevant brain structures-A 3-tesla MRI study of healthy men. oleh Morten S Hansen, Mohammad S Asghar, Jørn Wetterslev, Christian B Pipper, Johan Mårtensson, Lino Becerra, Anders Christensen, Janus D Nybing, Inger Havsteen, Mikael Boesen, Jørgen B Dahl