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  ______   __   __   _    _     _____     ______  
 /_   _//  \ \\/ // | \  / ||  |  ___||  /_   _// 
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   |_||      |_||   |_|\/|_||  |_____||    |_||   
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Text this: Identification of focal ARDS using PF ratio: a cross-sectional study