(“insulin like growth factor i”[MeSH Terms] OR “insulin like growth factor i”[All Fields] OR “igf 1′′[All Fields] OR (“insulin like growth factor i”[MeSH Terms] OR “insulin like growth factor i”[All Fields] OR “insulin like growth factor 1′′[All Fields]) OR “somatomedin C”[All Fields]) AND (“schizophrenia”[MeSH Terms] OR “schizophrenia”[All Fields] OR “schizophrenias”[All Fields] OR “schizophrenia s”[All Fields]). Here, IGF1 is linked to schizophrenia.