GREAT LAKES LITHOTRIPSY PARTNERSHIP, LP

MOBILE KIDNEY STONE CENTERS OF CA II, LTD

Lithotripsy Clinic/Center

LITHOTRIPTERS, INC

Lithotripsy Clinic/Center

BLUE RIDGE UROLOGY SERVICES LLC

Lithotripsy Clinic/Center

DALLAS LITHOTRIPSY, LP

Lithotripsy Clinic/Center

BUCKEYE UROLOGICAL SERVICES, LP

Lithotripsy Clinic/Center

MONTANA UROLOGICAL SERVICES, LLC

Lithotripsy Clinic/Center

SACRAMENTO ESL SERVICES, LLC

Lithotripsy Clinic/Center

WASHINGTON UROLOGICAL SERVICES, LLC

Lithotripsy Clinic/Center

UTAH LITHOTRIPSY, LP

Lithotripsy Clinic/Center

CASCADE UROLOGICAL SERVICES, LLC

Lithotripsy Clinic/Center

MOBILE KIDNEY STONE CENTERS OF CALIFORNIA, LTD

Lithotripsy Clinic/Center

RESTON LITHOTRIPSY LIMITED PARTNERSHIP

Lithotripsy Clinic/Center

WEST COAST LITHO SERVICES, LLC

Lithotripsy Clinic/Center

ROCKY MOUNTAIN LASER, L.P.

Lithotripsy Clinic/Center

CASCADE LASER SERVICES, LLC

Lithotripsy Clinic/Center

SAN DIEGO LITHOTRIPTERS LP I

Lithotripsy Clinic/Center

SAN DIEGO UROLOGY SERVICES LLC

Lithotripsy Clinic/Center

SOUTH ORANGE COUNTY LITHOTRIPTERS, LLC

Lithotripsy Clinic/Center

MEDSTONE INTERNATIONAL, INC.

Lithotripsy Clinic/Center

GREATER ALABAMA LITHOTRIPSY, LLC

Lithotripsy Clinic/Center

SI LITHOTRIPSY LLC

Lithotripsy Clinic/Center

TEXAS LITHOTRIPSY LP VIII

Lithotripsy Clinic/Center

SUNSHINE UROLOGICAL SERVICES, LP

Lithotripsy Clinic/Center

COLUMBIA UROLOGICAL SERVICES, LLC

Lithotripsy Clinic/Center