But James Bradley, the Pittsburgh Steelers' chief physician, says not enough research has been done on the new fields to validate a safety advantage.

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Dr. Leonardo Lozada, the chief physician at St Luke's Health Systems, said he heard the explosion at the hospital, which is a block and a half from the restaurant.

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Luke's Health Systems, where he is chief physician.

CNN: 2 missing, 14 hurt in Kansas City gas explosion

"In the face of new and compelling data that there should be no elective deliveries before 39 weeks, there is very little rational basis to act differently, " says Jonathan Perlin, president of clinical and physician services and chief medical officer at HCA. He says 96% of deliveries now meet the 39-week rule.

WSJ: Push to Reduce Rates of Early Term Induced Deliveries

Larry Norton sees some of the toughest cases as deputy physician-in-chief for breast cancer at Memorial Sloan-Kettering Cancer Center.

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Piper Cancer Center Clinical Trials at Scottsdale Healthcare in Arizona and Physician-In-Chief of The Translational Genomics Research Institute (TGEN).

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"It would have been a giant set-back for Montefiore" if the ruling were overturned, said chief executive Steven Safyer, a physician.

WSJ: Ruling Underscores Hospitals' Strategy

Chief Warrant Officer Michael Cahill had served in the National Guard and worked as a physician's assistant for decades.

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