PPP1R1B and schizophrenia: Comparison of dopamine receptor D2 (DRD2), dopamine receptor D3 (DRD3), and dopamine and cyclic adenosine 3′,5′-monophosphate regulated phosphoprotein-32 (DARPP-32) mRNA levels among controls and patients with psychotic disorder NOS and schizophrenia/schizophreniform disorder (median (interquartile range)).