Table 2.

Procedures of the phase 4 clinical trial.

Procedures	Visits
	0	1	2	3	4	Washout	5	6	7	8	9
Informed consent	✓	—a	—	—	—	—	—	—	—	—	—
Inclusion and exclusion	—	✓	—	—	—	—	—	✓	—	—	—
Vein perception	—	✓	—	—	—	—	—	✓	—	—	—
Sequence allocation	✓	—	—	—	—	—	—	—	—	—	—
Intervention or comparator	—	✓	—	—	—	—	—	✓	—	—	—
Pain assessment	—	✓	—	—	—	—	—	✓	—	—	—
Hemolysis	—	✓	—	—	—	—	—	✓	—	—	—
Skin type assessment	—	✓	—	—	—	—	—	—	—	—	—

^aNot applicable.