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Content validityestablishing and reporting the evidence in newly developed patient-reported outcomes (PRO) instruments for medical product evaluation: ISPOR PRO good research practices task force reportPart 2assessing respondent understanding

Male infertility (approximately 50% of the cases of infertility among couples [7]) is gradually leading to depression and other psychological outcomes, and this might be potential signs of serious future consequences

Gut 35 : 247251 Thomas GA et al

Updated knowledge on current pattern of tobacco use and trends in prevalence of tobacco use will be beneficial for policy makers to curb the current tobacco epidemic 9

#7 Once you have the lid off, you can gently pop the surrounding cover off