Not a DOI

The resolution service at https://doi.org resolves DOIs. You have attempted to resolve core/services/aop-cambridge-core/content/view/576DCD7F46AA15E2CBD6C484D782C1C1/S0954422416000287a.pdf/metabolic-consequences-of-obesity-and-insulin-resistance-in-polycystic-ovary-syndrome-diagnostic-and-methodological-challenges.pdf, which is not a DOI.

core/services/aop-cambridge-core/content/view/576DCD7F46AA15E2CBD6C484D782C1C1/S0954422416000287a.pdf/metabolic-consequences-of-obesity-and-insulin-resistance-in-polycystic-ovary-syndrome-diagnostic-and-methodological-challenges.pdf may be a Handle (DOIs are a special sort of Handle). If core/services/aop-cambridge-core/content/view/576DCD7F46AA15E2CBD6C484D782C1C1/S0954422416000287a.pdf/metabolic-consequences-of-obesity-and-insulin-resistance-in-polycystic-ovary-syndrome-diagnostic-and-methodological-challenges.pdf is a valid Handle you should be able to resolve it at https://hdl.handle.net.