Table 1 Selected Search Strategies for review articles

S1

Search ((((challenges [Title/Abstract]) OR obstacles [Title/Abstract]) OR limitations [Title/Abstract]) OR problems [Title/Abstract]) OR barriers [Title/Abstract]

S2

Search ((provision [Title/Abstract]) OR bringing [Title/Abstract]) OR access [Title/Abstract]

S3

Search (((((palliative care [MeSH Terms]) OR palliative medicine [Title/Abstract]) OR hospice care [Title/Abstract]) OR supportive care [Title/Abstract]) OR terminal care [Title/Abstract]) OR end of life care [Title/Abstract]

S4

Search (((((cancer [Title/Abstract]) OR tumor [Title/Abstract]) OR neoplasms [Title/Abstract]) OR terminal cancer [Title/Abstract]) OR metastatic cancer [Title/Abstract]) OR malignant [Title/Abstract]

S5

Search review*[Title/Abstract] Sort by: Best Match

S6

S1 AND S2 AND S3 AND S4 AND S5

S7

S1 AND S2 AND S3 AND S4 AND S5 (Limiters - Date of Publication: 20000101–20,190,110; English Language)

S1

TI challenges OR TI barriers OR TI problems OR TI limitations OR TI obstacles

S2

AB challenges OR AB barriers OR AB problems OR AB limitations OR AB obstacles

S3

AB provision OR AB bringing OR AB access

S4

TI provision OR TI bringing OR TI access

S5

TI palliative care OR TI palliative medicine OR TI hospice care OR TI supportive care OR TI terminal care OR TI end of life care

S5

AB palliative care OR AB palliative medicine OR AB hospice care OR AB supportive care OR AB terminal care OR AB end of life care

S7

AB cancer OR AB tumor OR AB neoplasms OR AB terminal cancer OR AB metastatic cancer OR AB malignant

S8

TI cancer OR TI tumor OR TI neoplasms OR TI terminal cancer OR TI metastatic cancer OR TI malignant

S9

TI review*

S10

AB review*

S11

S1 OR S2

S12

S3 OR S4

S13

S5 OR S6

S14

S7 OR S8

S15

S9 OR S10

S16

S11 AND S12 AND S13 AND S14 AND S15

S17

S11 AND S12 AND S13 AND S14 AND S15 (Limiters - Date of Publication: 20000101–20,190,110; English Language)