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Network evidence of included studies. The size of red circles represent the total hips number of each invention. The thickness of solid lines represent the number of trials comparing the connected inventions. MoPc = metal-on-conventional polyethylene, MoPxl = metal-on-highly crosslinked polyethylene, CoPc = ceramic-on-conventional polyethylene, CoPxl = ceramic-on-highly crosslinked polyethylene, CoC = ceramic-on-ceramic, MoM = metal-on-metal.
