Do extreme summers increase blood vitamin D (25-hydroxyvitamin D) levels?

• Frank Bernhard Kraus ,

  Roles Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Project administration, Writing – original draft, Writing – review & editing

  * E-mail: bernhard.kraus@zoologie.uni-halle.de, bernhard.kraus@uk-halle.de

  Affiliation Central Laboratory, University Hospital Halle, Halle/Saale, Germany

  https://orcid.org/0000-0003-4354-9952

  ⨯
• Daniel Medenwald,

  Roles Formal analysis, Methodology, Writing – review & editing

  Affiliations Institute of Medical Epidemiology, Biostatistics and Informatics, Martin-Luther-University Halle-Wittenberg, Halle, Germany, Department of Radiation Oncology, University Hospital Halle (Saale), Halle/Saale, Germany

  https://orcid.org/0000-0001-8920-2853

  ⨯
• Beatrice Ludwig-Kraus

  Roles Conceptualization, Investigation, Methodology, Project administration, Resources, Writing – review & editing

  Affiliation Central Laboratory, University Hospital Halle, Halle/Saale, Germany

  ⨯