Lee SY, Tan KH
Singapore Med J 2013; 54(8): 432-436; http://dx.doi.org/10.11622/smedj.2013149

A digitally enhanced Fig. 3 is added for greater clarity. The approximate area of the lung was calculated by multiplying the two longest perpendicular diameters of the lung. 

Singapore Med J 2013; 54(11): 661; http://dx.doi.org/10.11622/smedj.2013229