Talvez deva tentar algumas variações de ortografia:
decrease burden » disease burden (Expandir a busca), decrease further (Expandir a busca)
burden disease » bursal disease (Expandir a busca)
decrease to » decreased to (Expandir a busca), decrease toc (Expandir a busca), decrease the (Expandir a busca)
disease and » diseases and (Expandir a busca)
and objects » and object (Expandir a busca), and subjects (Expandir a busca), and objectives (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

• Remover as aspas pode possibilitar buscas mais amplas: (( decrease _ decrease to decrease ) OR ( decrease burden disease and objects ))~.