It has been very gratifying to see so much interest in my recent work
on comorbidity among common mental disorders,1
as evidenced by the letter from Borsboom and the recent replication and extension
by Vollebergh et al.2 I will offer a few
brief remarks on some of the points raised in Borsboom's letter.
Krueger RF. The Structure of the DSM. Arch Gen Psychiatry. 2002;59(6):570-571. doi: