Research methods

Medical Marijuana and Opioids (MEMO) Study: protocol of a longitudinal cohort study to examine if medical cannabis reduces opioid use among adults with chronic pain
Chinazo O Cunningham, Joanna L Starrels, Chenshu Zhang, Marcus A Bachhuber, Nancy L Sohler, Frances R Levin, Haruka Minami, Deepika E Slawek, Julia H Arnsten

BMJ Open Dec 2020, 10 (12) e043400; DOI: 10.1136/bmjopen-2020-043400
Biomarkers for length of hospital stay, changes in muscle mass, strength and physical function in older medical patients: protocol for the Copenhagen PROTECT study—a prospective cohort study
Rikke S Kamper, Martin Schultz, Sofie K Hansen, Helle Andersen, Anette Ekmann, Hanne Nygaard, Fredrik Helland, Miriam R Wejse, Camilla B Rahbek, Tim Noerst, Eckart Pressel, Finn Erland Nielsen, Charlotte Suetta

BMJ Open Dec 2020, 10 (12) e042786; DOI: 10.1136/bmjopen-2020-042786
Impact of the COVID-19 pandemic on mental health and well-being of communities: an exploratory qualitative study protocol
Anam Shahil Feroz, Naureen Akber Ali, Noshaba Akber Ali, Ridah Feroz, Salima Nazim Meghani, Sarah Saleem

BMJ Open Dec 2020, 10 (12) e041641; DOI: 10.1136/bmjopen-2020-041641
Variation in model performance by data cleanliness and classification methods in the prediction of 30-day ICU mortality, a US nationwide retrospective cohort and simulation study
Theodore J Iwashyna, Cheng Ma, Xiao Qing Wang, Sarah Seelye, Ji Zhu, Akbar K Waljee

BMJ Open Dec 2020, 10 (12) e041421; DOI: 10.1136/bmjopen-2020-041421
The BDS checklist as measure of illness severity: a cross-sectional cohort study in the Danish general population, primary care and specialised setting
Marie Weinreich Petersen, Marianne Rosendal, Eva Ørnbøl, Per Fink, Torben Jørgensen, Thomas Meinertz Dantoft, Andreas Schröder

BMJ Open Dec 2020, 10 (12) e042880; DOI: 10.1136/bmjopen-2020-042880
Health service needs and perspectives of remote forest communities in Papua New Guinea: study protocol for combined clinical and rapid anthropological assessments with parallel treatment of urgent cases
Jo Middleton, Mohammad Yazid Abdad, Emilie Beauchamp, Gavin Colthart, Maxwell J F Cooper, Francesca Dem, James Fairhead, Caroline L Grundy, Michael G Head, Joao Inacio, Mavis Jimbudo, Christopher Iain Jones, Martina Konecna, Moses Laman, Hayley MacGregor, Vojtech Novotny, Mika Peck, Jason Paliau, Jonah Philip, Willie Pomat, Chrissy H Roberts, Shen Sui, Alan J Stewart, Stephen L Walker, Jackie A Cassell

BMJ Open Oct 2020, 10 (10) e041784; DOI: 10.1136/bmjopen-2020-041784
Using the theoretical domains framework and the behavioural change wheel in an overarching synthesis of systematic reviews
Michelle Richardson, Claire Louise Khouja, Katy Sutcliffe, James Thomas

BMJ Open Jun 2019, 9 (6) e024950; DOI: 10.1136/bmjopen-2018-024950
Innovative approaches to investigator-initiated, multicentre paediatric clinical trials in Canada
Lauren E Kelly, Lawrence Richer, Samina Ali, Amy C Plint, Naveen Poonai, Stephen B Freedman, Lisa Knisley, Carolyn Shimmin, Serena Hickes, Geert W ’t Jong, Petros Pechlivanoglou, Martin Offringa, Thierry Lacaze, Terry P Klassen

BMJ Open Jun 2019, 9 (6) e029024; DOI: 10.1136/bmjopen-2019-029024
Power estimations for non-primary outcomes in randomised clinical trials
Janus Christian Jakobsen, Christian Ovesen, Per Winkel, Jørgen Hilden, Christian Gluud, Jørn Wetterslev

BMJ Open Jun 2019, 9 (6) e027092; DOI: 10.1136/bmjopen-2018-027092
Comparing the effects of two spasticity management strategies on the long-term outcomes of individuals with bilateral spastic cerebral palsy: a multicentre cohort study protocol
Meghan E Munger, Brian Po-Jung Chen, Bruce A MacWilliams, Mark L McMulkin, Michael H Schwartz

BMJ Open Jun 2019, 9 (6) e027486; DOI: 10.1136/bmjopen-2018-027486

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