Table 4 The types and frequencies of reference errors

A

Reference URLs linked to a wrong page or a ‘404 page not available’ (N₁) among total references listed (N₂)

191/274 (69.7)

B

The authors not found on PubMed, Amazon (for books), or Google (N₁) among the authors appearing in the references (N₂)

59/350 (16.9)

C

Incorrectly titled articles or books (N₁) among the references (N₂)

148/152 (97.4)