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Their pens read "PharmFree," which means they don't take personal gifts of any size from the pharmaceutical industry. And that is touching off a quiet ethics war reverberating through the halls of academia and hospitals across the country. Messrs. Kenyon and Petersen are among a growing band of stethoscope-wearing students who believe the medical profession needs more detachment from big pharmaceutical firms.(Drug companies seem to be finding plenty of takers though: spending on marketing to physicians jumped from $12.1 billion in 1999 to $22 billion in 2003 ($16 billion of which was in free samples)