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             ___     __   _    _    _    _    _   
    ___     / _ \\  | || | || | || | || | \  / || 
   /   ||  | / \ || | '--' || | || | || |  \/  || 
  | [] ||  | \_/ || | .--. || | \\_/ || | .  . || 
   \__ ||   \___//  |_|| |_||  \____//  |_|\/|_|| 
    -|_||   `---`   `-`  `-`    `---`   `-`  `-`  
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Text this: Identification of focal ARDS using PF ratio: a cross-sectional study