“…22,24,29,38,[40][41][42]49,52 Concerning the age of the study populations, three types of papers were identified: a. Fourteen papers specifically stated, that they only included adult patients. 21,[28][29][30]35,39,40,42,46,47,50,51,53,54 b. Fourteen studies did not explicitly state the lower age limit but reported a range from birth to an adult age, for example, 0-65 years, [25][26][27][31][32][33][34]36,37,41,43,44,48,49 and the percentages of these youngest age-groups were low (1.0%-32.5%) in all 14 papers. Also, in eight of these papers, the diagnoses of the included patients indicated that only adults were included (ALS, 27 COPD, 31,33,44 lung cancer, 31,48 IPD, 33 HIV 32 and chronic life-limiting diseases 34,…”