Correction to: *Scientific Reports* 10.1038/s41598-018-30559-7, published online 13 August 2018

This Article contains an error in the Methods section.

"(2) an abnormal CSF (i.e. reactive VDRL and/or greater than 4 leukocytes/mm^3^ and protein concentration less than 40 mg/dl);"

should read:

"(2) an abnormal CSF (i.e reactive VDRL and/or greater than 4 leukocytes/mm^3^ and protein concentration greater than 40 mg/dl);"
