| Http://: https://medlineplus.gov/genetics/condition/tetrahydrobiopterin-deficiency/ |
| Http://: https://pubmed.ncbi.nlm.nih.gov/11388593/ |
| Http://: https://medlineplus.gov/genetics/condition/tetrahydrobiopterin-deficiency/ |
| Http://: https://pubmed.ncbi.nlm.nih.gov/11388593/ |