Complex joints GWAS Genes Genome-Wide Association Study Genome-wide association studies Genomics Genotype Humans Joint effect Multiple testing Norwegian (people) Oscillatory functions Phenotype Polygenic association Polymorphism, Single Nucleotide SNP Single nucleotide polymorphisms Sliding Window Wavelet analysis Wavelet regression Wavelet transforms alternative hypothesis article cohort analysis controlled study feasibility study genome-wide association study genomics genotype human