Data abstraction
A data collection sheet was created for the purpose of the study. Target data include author name, type of study, year of publication, time frame of study conduction, study setting, sample size, selection criteria, patients’ characteristics, method and time of diagnosis of PAS, description of treatment strategy including number and duration of sessions, clinical outcomes, and adverse effects. Data were abstracted from the article text, tables, and figures. All articles were published in English and no translation was required.