Table 1:

Electrical stimulation waveform parameters.

	Symmetric		Asymmetric (anodic-first)
	Cathodic-first	Anodic-first	20 time ratio	10 time ratio	5 time ratio	2 time ratio
40 μs	✓	✓	✓	✓	✓	✓
80 μs	✓	✓	✓
120 μs	✓	✓
0.5 ms	✓	✓
1 ms	✓
4 ms	✓