Five months after the on-field collapse of Buffalo Bills safety Damar Hamlin, the NFL is expanding its efforts to prevent cardiac arrest fatalities among athletes.

The league has increased membership of the The Smart Heart Sports Coalition — the group it formed in March to advocate for widespread adoption of policies to prevent sudden cardiac arrest among athletes — to 26 organizations. Major properties joining the coalition include the NWSL, WNBA, WTA, and USTA.

The NBA, NHL, MLB, and MLS have been coalition members with the NFL from the outset as the group works with lawmakers in pursuit of policy improvements, particularly those geared toward high school athletes.