English to Spanish Medical Medical (general) problemas de la piel

en un texto que habla sobre cabinas de bronceado aparece lo siguiente:

The comparison group consisted
of participants who reported having never used a sunbed
(never user) or those who had used one more than 12
months ago (past user). Past and current users of sunbeds (ever
user) were additionally asked about where they had last used
a sunbed (eg, tanning studio, fitness center), the advisory service
they had been provided with before using the sunbed, and
the factors that motivated their sunbed use.

no sé cómo poner ever users, será "usuarios al menos una vez" me gustaria encontrar algo más corto pero hasta ahora no he podido
gracias por su ayuda