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Table 1.

DeCS – MESH.

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Table 2.

Databases searched, search strategies, and study selection process.

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Table 3.

Characteristics of the studies.

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Fig 1.

Flow diagram of the literature search according to PRISMA guidelines.

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Table 4.

Overview of dosage, efficacy, and safety profiles of β₂-agonists.

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Table 4 Expand

Table 5.

Quality of the studies.

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Fig 2.

Quality of the studies.

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