Author contributions
Neeltje Steeghs and Xiaofei Zhou contributed to the conception of the work. Melinda Pruis, Carla van Herpen, Vickie Lu, John Redman and Xiaofei Zhou contributed to the design of the work. Neeltje Steeghs, Melinda Pruis, Vickie Lu and Xiaofei Zhou were involved with the acquisition of data. Neeltje Steeghs, Vickie Lu, John Redman and Xiaofei Zhou contributed to the analysis of data. Neeltje Steeghs, Carla van Herpen, Vickie Lu, John Redman and Xiaofei Zhou aided with the interpretation of data. All authors drafted the work or revised it critically for important intellectual content and provided approval of the final version of the manuscript to be published. All of the authors also agree to be accountable for all aspects of the work, which includes ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.