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. 2023 Jul 21;23:505. doi: 10.1186/s12903-023-03192-8

Fig. 2.

Fig. 2

The distribution of the 24 included studies by (A) country, (B) according to studies design and (C) according to the physical methods of salivary stimulation and the target population, or (D) according to the systemic condition associated with hyposalivation or for healthy subjects without hyposalivation. The color scale indicates the number of studies in the “parts of whole graphs”, as shown in their right