Talvez deva tentar algumas variações de ortografia:
decrease invariant » decreases ovarian (Expandir a busca), decreased ovarian (Expandir a busca)
invariant objects » invariant sets (Expandir a busca), invariant moments (Expandir a busca), invariant tests (Expandir a busca)
decreased risk » increased risk (Expandir a busca), decreased in (Expandir a busca)
risk decrease » risk decreases (Expandir a busca), risk increase (Expandir a busca), break decrease (Expandir a busca)
in decrease » in decreased (Expandir a busca), on decrease (Expandir a busca), pain decrease (Expandir a busca)

Você pode obter mais resultados ajustando o argumento de busca.

• Remover as aspas pode possibilitar buscas mais amplas: (( decrease in decrease OR decrease ) OR ( decreased risk decrease invariant objects ))~.