Acute Disease article 22 Female 20 Male 20 Human 18 human 18 priority journal 16 Porphyria 14 Support, Non-U.S. Gov't 14 female 14 male 14 porphyria 14 Adult 12 Chronic Disease 12 acute disease 12 Ammonia-Lyases 10 Porphyrins 10 adult 10 controlled study 10 Aged 8 Animals 8 Erythrocytes 8 Hydroxymethylbilane Synthase 8 Pedigree 8 Porphobilinogen Synthase 8 Skin Diseases 8 erythrocyte 8 porphyrin 8 skin disease 8 Adolescent 6