About the Authors

Suzanne C Cannegieter

Affiliation Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, Netherlands

Carine J. M Doggen

Affiliation Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, Netherlands

Hans C van Houwelingen

Affiliation Department of Medical Statistics, Leiden University Medical Center, Leiden, Netherlands

Frits R Rosendaal

To whom correspondence should be addressed. E-mail: F.R.Rosendaal@lumc.nl

Affiliations Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, Netherlands , Thrombosis and Haemostasis Research Center, Department of Haematology, Leiden University Medical Center, Leiden, Netherlands

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

SCC, CJMD, and FRR designed the study. HCvH contributed to the statistical methodology. SCC analyzed the data. SCC, CJMD, and FRR contributed to writing the paper.