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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

spermatogenesis --- sperm --- capacitation --- manchette --- centriole --- cilia --- contraceptive pill --- piRNA

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U.S. health care is a

Fraud --- Medical care --- Delivery of health care --- Delivery of medical care --- Health care --- Health care delivery --- Health services --- Healthcare --- Medical and health care industry --- Medical services --- Personal health services --- Public health --- Corrupt practices --- kickbacks, illicit referrals, overcharging and double billing, upcoding, unbundling, rent-a-patient, pill-mill schemes, insurance scams, short-pilling, off-label marketing, pharmaceuticals, rebate fraud.