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Differences in nitric oxide (NO) concentrations between different positions as a percentage of the adjusted NO dose (y-axis) for the different setups of the heating system (x-axis). The different bars reflect the different measurement positions (see Fig 1). Data are given as mean ± standard deviation. *P < 0.05, compared to the active humidification system (acthum). inacthum, inactive humidification system; nohum, no humidification system.
