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- spine4
- spine (03622436)3
- cochrane database of systematic reviews2
- jama: journal of the american medical association2
- lancet london england2
- american review of respiratory disease1
- annals of allergy asthma immunology official publication of the american college of allergy asthma immunology1
- british journal of haematology1
- canadian journal of gastroenterology journal canadien de gastroenterologie1