Gas 
n‐docosane
Gas chromatography–mass spectrometry (GC–MS) was performed as previously described.A Bruker Scion 436 GC–MS (Bruker Daltonics Inc) was used at a MS range of 50–800 m/z. Serial plasma samples from each patient were deliberately included in the same batch, but randomly distributed. Batches were designed to include approximately equal representation of age group, treatment arm, and sex. Calibration standards consisted of aliphatic alkanes (n‐decane, n‐docosane, n‐dodecane, n‐hexacosane, n‐nonadecane, n‐pentadecane, n‐triacontane; Millipore‐Sigma). Additionally, pooled quality controls were distributed throughout each batch, prior to each series of 10 experimental samples. Reproducibility of the quality control samples was analyzed based on variability of abundance of internal standards. Variability within and between batches was within an acceptable range, <20%.