Material 1:
Caucasian man, age 36, has intermittent joint pain in both knees over a period of several years. Recently (months) also joint pain in right elbow. 

No edema, swelling or joint effusion. 
The joint is intermittent.
The pain in the knees is sharp when active and aching when passive. 
The elbow joint pain is passive, aching.
The pain may worsen in severity and occurrence when eating peanuts. 

Comorbidities (in no especial order):
1. 6-8 previous episodes of acute pancreatitis. (Onset age 33)
2. Intermittent pain in kidney area since before the onset of pancreatitis (Undiagnosed, onset age 15)
3. Sleep apnea.
4. Undiagnosed pain upper jaw molar. 

End of material 1.

Question 1: Deduce five diagnoses in order of likelihood, in the following format
Diagnosis: 
Reasoning (three sentences):
Likelihood scale (unlikely, possible, likely, almost certain):

Thank you.
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