http://www.nejm.org/doi/full/10.1056/NEJMhpr051833 http://www.nejm.org/doi/full/10.1056/NEJMhpr051833 http://www.nejm.org/doi/full/10.1056/NEJMhpr051833 The Effect of China's One-Child Family Policy after 25 Years Hesketh http://www.nejm.org/doi/full/10.1056/NEJMhpr051833 “One Child” policy introducing The Effect of China's One-Child Family Policy after 25 ... http://www.nejm.org/doi/full/10.1056/NEJMhpr051833 The Effect of China’s One-Child Family Policy After 25 Years Hesketh the sweeping one-child policy The Effect of China's One Child Policy after 25 Years http://www.nejm.org/doi/full/10.1056/NEJMhpr051833 description http://www.nejm.org/doi/full/10.1056/NEJMhpr051833 New England Journal of Medicine one of the few research studies http://www.nejm.org/doi/full/10.1056/NEJMhpr051833 ramifications of OCP http://www.nejm.org/doi/full/10.1056/NEJMhpr051833 Hesketh a 2005 study Hesketh the ratio has risen study http://www.nejm.org/doi/full/10.1056/NEJMhpr051833