title: Suckers for success.
mesh_terms: D000818:Animals; D001815:Bloodletting / Q000266:history; D003247:Conservation of Natural Resources / Q000379:methods*; D056727:Endangered Species; D024764:Hirudin Therapy / Q000266:history / Q000706:statistics & numerical data; D049672:History, 19th Century; D049674:History, 21st Century; D049690:History, Ancient; D006801:Humans; D007865:Leeches / Q000378:metabolism*; D024763:Leeching / Q000009:adverse effects / Q000266:history / Q000706:statistics & numerical data