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Acknowledgement
The authors thank Pieter Zanen for his advice on statistical testing and Lydia Kool for her laboratory assistance.
Disclosure statement
The authors report no conflicts of interest. The authors alone are responsible for the content and writing of this article.
Additional information
Funding
The authors thank Qiagen for the provision of QFT-plus test kits free of charge. Qiagen had no role in the study design, collection, analysis or interpretation of data, manuscript preparation or decision to publish findings. Remaining part of the study was financed from institutional funds.