Correction to: Impact of phenylalanine on cognitive, cerebral, and neurometabolic parameters in adult patients with phenylketonuria (the PICO study): a randomized, placebo-controlled, crossover, noninferiority trial.

An amendment to this paper has been published and can be accessed via the original article.

Correction to: Trials (2020) 21:178

https://doi.org/10.1186/s13063-019-4022-z

Following publication of the original article [1], the authors notified us that Fig. 1 was incorrect.

Fig. 1

Study flow chart. Legend. T0 = screening; T1 = first assessment; T2 = second assessment; T3 = third assessment; T4 = fourth and last assessment

The corrected Fig. 1 is presented below.