Author Contributions: Ms Larsson had full access
to all of the data in the study and takes responsibility for the integrity
of the data and the accuracy of the data analysis.
Study concept and design: Larsson, Bergkvist,
Acquisition of data: Wolk.
Analysis and interpretation of data: Larsson,
Drafting of the manuscript: Larsson.
Critical revision of the manuscript for important
intellectual content: Larsson, Bergkvist, Wolk.
Statistical analysis: Larsson.
Obtained funding: Bergkvist, Wolk.
Administrative, technical, or material support:
Study supervision: Bergkvist, Wolk.
Funding/Support: This work was supported by
research grants from the Swedish Cancer Foundation and the Swedish Research
Role of the Sponsors: Funding sources had no
role in the design and conduct of the study; collection, management, analysis,
and interpretation of the data; and preparation, review, or approval of the