Unknown unknowns in suicide and depression

BMJ 2003; 326 doi: (Published 10 May 2003) Cite this as: BMJ 2003;326:f
  1. Richard Smith, editor

    A collection is just about to be published of the existential poetry of Donald Rumsfeld, the United States defence secretary. He looks set to join Yogi Berra and Sam Goldwyn as a man with a genius for producing sayings that are funny, weird, and possibly profound. I believe that his most popular “poem” shows that he must be a reader of medical journals. “As we know there are known knowns. There are things we know we know. We also know there are known unknowns. That is to say we know there are some things we …

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