Table 1 Eligibility criteria

Inclusion criteria

Age ≥ 18 years

One of the following conditions: inguinal hernia, gallstones, knee- or hip osteoarthritis

Access to the internet

Sufficient command of the Dutch language to complete decision aids and fill out questionnaires

General exclusion criteria

Current treatment for malignancy

Expected lifespan < 12 months

Pregnancy

Condition related exclusion criteria

 Inguinal hernia

Recurrent or complicated inguinal hernia (e.g. incarcerated hernia, strangulation, ileus)

 Gallstones

Complicated gallstone disease (e.g. cholecystitis, choledocholithiasis, biliary pancreatitis)

 Knee- or hip osteoarthritis

Early-stage osteoarthritis

Earlier arthroplasty