SLC39A8 and gastroesophageal reflux disease: The index SNV rs13107325 at 4q24 locus (PLACO P = 1.78 × 10−14 for GERD-schizophrenia; PLACO P = 4.19 × 10−8 for GERD-PTSD) was a significant eQTL for SLC39A8 (OMIM 608732), which encodes ZIP8 metal cation transporter.