Major League Soccer (MLS) is a men's professional soccer league sanctioned by U.S. Soccer that represents the sport's highest level in both the United States and Canada. MLS constitutes one of the major professional sports leagues of the United States and Canada. The league comprises 23 teamsâ20 in the U.S. and 3 in Canada.
Most blood collection in the US, UK and Hong Kong is done with an evacuated tube system, (two common systems are Vacutainer (Becton, Dickinson and company) and Vacuette (Greiner Bio-One GmbH). The equipment consists of a plastic hub, a hypodermic needle and a vacuum tube.
To avoid traversing the artery, a single-wall needle is slowly inserted through the skin toward the vein with continuous aspiration on the needle hub. 1  Number 4- or 5-French (Fr) pigtail (or similarly shaped) catheters are used for venacavography with the side holes placed at the common iliac vein confluence.