Toxicokinetics
Search terms	TOPIC (TITLE/ABSTRACT in PubMed): nickel* OR Ni AND TOPIC (All fields in PubMed): occurrence or exposure AND TOPIC (All fields in PubMed): food or drinking water or diet* Timespan = Last 5 years
Occurrence of nickel nanoparticles
Search terms	TOPIC (TITLE/ABSTRACT in PubMed): nickel nanoparticle AND TOPIC (ALL FIELDS in PubMed): food or drinking water Timespan = All years
Migration of nickel from food contact material
Search terms	TOPIC (TITLE/ABSTRACT in PubMed): food AND TOPIC (ALL FIELDS in PubMed): nickel AND TOPIC (ALL FIELDS in PubMed): migration or release Timespan = All years

After removal of all duplicates, 1,165 papers were screened for relevance based on title and abstract.