Erratum to: Methods for evaluating medical tests and biomarkers.

[This corrects the article DOI: 10.1186/s41512-016-0001-y.].

Randomized controlled trials on PET: a systematic review of topics, design, and quality.

Unlabelled: Randomized controlled trials (RCTs) add important information to diagnostic accuracy studies in the evaluation of PET and PET/CT. We evaluated how many RCTs on PET existed, which clinical topics they addressed, and what their design and quality were.

Methods: We searched MEDLINE, EMBASE, and the Cochrane Central Register of Controlled Trials (Clinical Trials) up to August 2010.

Effectiveness of early in comparison to late(r) treatment in children with amblyopia or its risk factors: a systematic review.

Purpose: To evaluate the effectiveness of early in comparison to late(r) treatment in children with (1) amblyopia or (2) its risk factors, such as refractive errors and strabismus.

Methods: Eight bibliographic databases were searched with no limitation to a specific year of publication or language. Studies including children and juveniles with amblyopia or its risk factors were considered for this review.

Diagnostic accuracy of vision screening tests for the detection of amblyopia and its risk factors: a systematic review.

Aim: This systematic review evaluates the diagnostic accuracy of preschool vision screening tests for the detection of amblyopia and its risk factors.

Methods: The literature searches were conducted in nine bibliographic databases. No limitation to a specific study design, year of publication or language was applied.

Effectiveness of screening preschool children for amblyopia: a systematic review.

Background: Amblyopia and amblyogenic factors like strabismus and refractive errors are the most common vision disorders in children. Although different studies suggest that preschool vision screening is associated with a reduced prevalence rate of amblyopia, the value of these programmes is the subject of a continuing scientific and health policy discussion. Therefore, this systematic review focuses on the question of whether screening for amblyopia in children up to the age of six years leads to better vision outcomes.

Does competitive apnea diving have a long-term risk? Cardiopulmonary findings in breath-hold divers.

Study Purpose: The aim of this study was to investigate the cardiopulmonary status in a competitive apnea diving team.

Design: This study was conducted with a cross-sectional study design in which subjects had to undergo a predefined series of cardiopulmonary examinations.

Subjects: Eight competitive apnea divers (mean age, 26.