Response to the letter entitled: Re: Pre-treatment serum vitamin D deficiency is associated with increased inflammatory biomarkers and short overall survival in patients with pancreatic cancer: Analysis of the prognostic effect of serum vitamin D on pancreatic cancer: Several confounders
1 Department of Oncology, Clinical Cancer Research Center, Aalborg University Hospital, Aalborg, Denmark; Department of Clinical Medicine, Faculty of Medicine, Aalborg University, Aalborg, Denmark. Electronic address: loskr@rn.dk.
2 Department of Oncology, Clinical Cancer Research Center, Aalborg University Hospital, Aalborg, Denmark.
3 Department of Oncology, Clinical Cancer Research Center, Aalborg University Hospital, Aalborg, Denmark; Department of Clinical Medicine, Faculty of Medicine, Aalborg University, Aalborg, Denmark.
4 Department of Clinical Medicine, Faculty of Medicine, Aalborg University, Aalborg, Denmark; Department of Haematology, Clinical Cancer Research Center, Aalborg University Hospital, Aalborg, Denmark.
5 Department of Clinical Biochemistry, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark; Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark.
6 Department of Oncology, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark.
7 Department of Surgery, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark.
8 Department of Pathology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark.
9 Department of Oncology, Zealand University Hospital, Næstved, Denmark.
10 Department of Oncology, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark; Department of Oncology and Palliative Care, North Zealand University Hospital, Hillerød, Denmark.
11 Department of Oncology and Palliative Care, North Zealand University Hospital, Hillerød, Denmark.
12 Department of Oncology, Odense University Hospital, Odense, Denmark.
13 Academy of Geriatric Cancer Research (AgeCare), Odense University Hospital, Odense, Denmark; Institute of Clinical Research, University of Southern Denmark, Odense, Denmark.
14 Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark; Department of Oncology, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark; Department of Medicine, Herlev and Gentofte Hospital, Copenhagen University Hospital, Herlev, Denmark.