NALCN and congenital contractures of the limbs and face, hypotonia, and developmental delay: Pathogenetic variants of the NALCN gene, in homozygosity or compound heterozygosity with a putative LoF role, are associated with IHPRF1, that is inherited in an autosomal recessive manner, in contrast to heterozygous pathogenic variants in NALCN with a GoF effects, that are associated with CLIFAHDD.