Comparison of Fixed and Age-Sex-Adjusted NFPA Standards for Cardiopulmonary Fitness in Thai Wildland Firefighters - Jinjuta Panumasvivat; Pheerasak Assavanopakun; Kampanat Wangsan; Vithawat Surawattanasakul; Wachiranun Sirikul; Pannawich Chantaklang; Thitirat Vinsirivorakul (Journal of Occupational & Environmental Medicine, 2026)