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MRH and SLMB shared first authorship.
Contributors MRH, SLMB, JAGvR and TRDJR were involved in study design. MRH, SLMB, APR, AB, BRL and AAK were involved in data collection. MRH, SLMB and APR performed the analysis. All authors were involved in interpretation of the data, drafting of the work, revising it critically and gave final approval of the version published.
Competing interests None declared.
Ethics approval Sample collection was performed according to ethical regulations of the UMC Utrecht and patients gave their written informed consent.
Provenance and peer review Not commissioned; externally peer reviewed.
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