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Over the last decade, studies have shown that standard procedures like PSA screening for prostate cancer and hormone replacement therapy for women do more harm than good. How did these procedures become standard in the first place? What else needs to be reevaluated? H. Gilbert Welch, of medicine at the Dartmouth Institute for Health Policy and Clinical Practice, writes an op-ed in the New York Times where he addresses other procedures that may need a closer look and ways we can allocate research spending to keep testing what we think is standard.