42 CFR 81.20 : Public Health (Part 1 To Parts 1009-1099) — (Part 1 To Chapters Ii-Iii) — Public Health Service, Department Of Health And Human Services (Part 1 To Parts 138-199) — Occupational Safety And Health Research And Related Activities (Part 80 To § 88.17) — Guidelines For Determining Probability Of Causation Under The Energy Employees Occupational Illness Compensation Program Act Of 2000 (§ 81.0 To Appendix A To Part 81) — Guidelines To Estimate Probability Of Causation (§ 81.20 To Appendix A To Part 81) — Required use of NIOSH-IREP.