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Publisher
- bmj18
- elsevier b.v.12
- elsevier bv12
- bmj publishing group ltd and european league against rheumatism6
- elsevier inc.6
- lancet publishing group5
- lancet publishing group (e-mail: cususerv@lancet.com)4
- united kingdom4
- universidad de cordoba, facultad de ciencias, departamento de botanica; asociacion de palinologos de lengua espanola3