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Jon Bon Jovi is tweeting his appreciation to the emergency personnel and hospital staff who took care of his wife over the weekend.  But exactly what happened isn't clear. 

In his tweet the rocker says Dorothea "sustained a minor hand injury due 2 a piece of broken glass." 

But a police source tells "The New York Post" Jon called 911 Saturday after Dorothea sliced open her left palm with a knife while chopping an onion.  The source adds that Dorothea arrived by ambulance to Beth Israel Medical Center, and received stitches before being released. 

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