import  re 
 
string  =  ( "1John Radcliffe Hospital/Oxford/United Kingdom, 11Ruhr-Universität \n " 
          "3/Bochum/Bochum/Germany, 3University of British Columbia/Vancouver/Canada, 4National \n " 
          "Institute of Neuroscience, National Center of Neurology and Psychiatry/Tokyo/Japan, \n " 
          "5University of Catania/Catania/Italy, 6F. Hoffmann-La Roche Ltd/Basel/Switzerland, 7 \n " 
          "University of Colorado School of Medicine/Aurora/United States of America" ) 
 
result =  re .sub ( r'(?:^|, )\d +(?!/)' ,  r'\g <0>=' ,  string ,  0 ,  re .MULTILINE ) .strip ( ) 
print ( result) 
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
				
				 
			
				
			
			
				
	
		
		
		
		 
	
		1=John Radcliffe Hospital/Oxford/United Kingdom, 11=Ruhr-Universität 
3/Bochum/Bochum/Germany, 3=University of British Columbia/Vancouver/Canada, 4=National 
Institute of Neuroscience, National Center of Neurology and Psychiatry/Tokyo/Japan, 
5=University of Catania/Catania/Italy, 6=F. Hoffmann-La Roche Ltd/Basel/Switzerland, 7= 
University of Colorado School of Medicine/Aurora/United States of America