Fig. 2

High-frequency probe (up to 60 μm, model L30-8, Mindray Innovation Center, Mindray North America, San Jose, CA, USA) with the size of a toothbrush (30 × 18 × 12 mm)
High-frequency probe (up to 60 μm, model L30-8, Mindray Innovation Center, Mindray North America, San Jose, CA, USA) with the size of a toothbrush (30 × 18 × 12 mm)