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Table 4 Eligibility criteria for the cohort group.

From: Rationale and design of The Delphi Trial – I(RCT)2: international randomized clinical trial of rheumatoid craniocervical treatment, an intervention-prognostic trial comparing 'early' surgery with conservative treatment [ISRCTN65076841]

Cohort Group
1. Ranawat III A
2. Ranawat III B
3. Too strong preference
   Conservative treatment
   Surgical treatment
4. AADI < 5 mm: conservative treatment preferential
5. AADI > 12 mm: surgical treatment preferential
6. Exclusion because of in and exclusion criteria