| Http://: https://medlineplus.gov/genetics/condition/erdheim-chester-disease/ |
| Http://: https://rarediseases.org/rare-diseases/erdheim-chester-disease/ |
| Http://: https://medlineplus.gov/genetics/condition/erdheim-chester-disease/ |
| Http://: https://rarediseases.org/rare-diseases/erdheim-chester-disease/ |