Correction to: Scientific Reports https://doi.org/10.1038/s41598-018-22659-1, published online 19 March 2018

The Acknowledgements section in this Article is incomplete.

“We thank Eric Fomevor, Isaac Yaw Asamoah and Evans Gawu for their technical and logistical help during the study. We especially thank the children and their parents at St Michael’s Hospital and Jachie Primary School for participating in the study.”

should read:

“We thank Eric Fomevor, Isaac Yaw Asamoah and Evans Gawu for their technical and logistical help during the study. We especially thank the children and their parents at St Michael’s Hospital and Jachie Primary School for participating in the study. The work was funded by grants of the Collaborative Research Center 841 of the German Research Foundation and the Werner-Otto Foundation, Hamburg, Germany.”