HeredityGeneticsElephantiasisDiseases in TwinsHistory, 19th CenturyTwins, MonozygoticTwins, DizygoticSwedenEnvironmentGenes, RecessivePhenotypeGenetic Predisposition to DiseasePedigreeFamily HealthRisk FactorsGenetic LinkageGenes, DominantMolecular Sequence DataSex FactorsBiological EvolutionGenetic VariationAge FactorsGenotypePolymorphism, Single NucleotideQuestionnairesPrevalenceAmino Acid SequenceCohort StudiesBase SequencePhylogenySequence Homology, Amino Acid