Thomas  Ptak  to  Cohort Studies
                            
                            
                                This is a "connection" page, showing publications  Thomas  Ptak  has written about  Cohort Studies.
                            
                            
                            
                                
                                    
                                            
    
        
        
        
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            Nelson BP, Senecal EL, Hong C, Ptak T, Thomas SH. Opioid analgesia and assessment of the sonographic Murphy sign. J Emerg Med. 2005 May; 28(4):409-13.
            
            
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