Symptoms and risk factors of ledderhose - An overview of the symptoms and risk factors associated with Ledderhose disease.
Diabetes and Dupuytren's - The link between these two is one that I believe exists.
Alcohol and Dupuytren's / Ledderhose - This one is less conclusive but overall it does look like there is a association between the two.
Smoking - I think the link exists, do you?
Epilepsy - May be a link.
Genetic Link - There is clearly a genetic element to Dupuytren's.