Purchasing groups add to their bulk.
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D003284:Contract Services / Q000191:economics / Q000706:statistics & numerical data; D003625:Data Collection; D017754:Group Purchasing / Q000706:statistics & numerical data; D017008:Negotiating; D011682:Purchasing, Hospital / Q000458:organization & administration* / Q000706:statistics & numerical data; D012954:Societies, Hospital; D014481:United States