Jaggi M, Karlen W, Keller E. Forecasting intracranial hypertension using waveform and time series features. In: Vasospasm 2015 - 13th International Conference on Neurovascular Events after Subarachnoid Hemorrhage. Nagano, Japan: 2015.

Friedman Z, Karlen W. Medical Devices and Information Communication Technologies for the Base of the Pyramid. In: Hostettler, Silvia and Hazboun, Eileen and Bolay, Jean-Claude, editors. Technologies for Development. What is Essential?. Springer International Publishing; 2015. p. 113--118.      [DOI]      [File] 

Pham NM, Karlen W. Mobile lab-on-a-chip (mLOC) for early detection of malaria in remote settings. In: Micro-Med-A. Stellenbosch: 2015.

Karlen W, Pharaoh H, Conradie H, Scheffer C. Pneumonia assessment using mHealth IMCI tools for community health workers. In: European Congress on Tropical Medicine and International Health (ECTMIH) 2015. Basel, Switzerland: 2015.

Karlen W, Raihana S, Dumont GA, Ansermino JM. PPG quality evaluation reduces SpO2 variability in spot check readings. In: Innovations and Applications of Monitoring Perfusion, Oxygenation and Ventilation (IAMPOV) 2015. Tokyo, Japan: 2015.

Jaggi M, Luca VD, Karlen W. Predicting intracranial pressure elevation using multiparameter summaries of physiological channels. In: Annual Meeting of the Swiss Society for Biomedical Engineering (SSBE). Neuchatel, Switzerland: 2015.

Gan H, Karlen W, Dunsmuir D, Zhou G, Chiu M, Dumont GA, Ansermino JM. The Performance of a Mobile Phone Respiratory Rate Counter Compared to the WHO ARI Timer. Journal of Healthcare Engineering. 2015; 6(4):691--704.      [DOI]      [File] 

Karlen W, Petersen CL, Dumont GA, Ansermino JM. Variability in estimating shunt from single pulse oximetry measurement. Physiological Measurement. 2015; 36(5):967--981.      [DOI]      [File] 

Dunsmuir D, Karlen W, Gan H, Chiu M, Petersen C, Dumont GA, Ansermino JM. A Mobile Application for Measuring Respiratory Rate. In: Canadian Pediatric Anesthesia Society (CPAS) Meeting. Quebec City, QC, Canada: 2014.

Karlen W, Wiens MO, Gan H, Dunsmuir D, Chiu M, Dumont GA, Ansermino JM. Assessing the Quality of Manual Respiratory Rate Measurements using Mobile Devices. In: Appropriate Healthcare Technologies for Low Resource Settings (AHT 2014). London, UK: IET; 2014. p. 1--4.

Karlen W, Scheffer C. Design of an interactive medical guideline application for community health workers. In: Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). 2014. p. 1366--1369.      [DOI] 

Dehkordi P, Garde A, Karlen W, Petersen CL, Ansermino JM, Dumont GA. Detrended fluctuation analysis of photoplethysmogram pulse rate intervals in sleep disordered breathing. In: 2014 IEEE Healthcare Innovation Conference (HIC). Seattle: IEEE Engineering in Medicine and Biology Society; 2014. p. 323--326.      [DOI]      [File] 

Garde A, Dehkordi P, Karlen W, Wensley D, Ansermino JM, Dumont GA. Development of a screening tool for sleep disordered breathing in children using the phone oximeter™. PLoS ONE. 2014; 9(11):e112959.      [DOI]      [File] 

Wiens MO, Gan H, Kabakyenga J, Barigye C, Zhou G, Karlen W, Ansermino JM, Larson C, MacLeod S. Early and late outcomes following treatment for sick-child visits at a rural level IV Health Center in Uganda. In: 17th World Congress of Basic and Clinical Pharmacology. Cape Town: 2014.

Garde A, Karlen W, Ansermino JM, Dumont GA. Estimating respiratory and heart rates from the correntropy spectral density of the photoplethysmogram. PLoS ONE. 2014; 9(1):e86427.      [DOI]      [File] 

Karlen W, Gan H, Chiu M, Dunsmuir D, Zhou G, Dumont GA, Ansermino JM. Improving the accuracy and efficiency of respiratory rate measurements in children using mobile devices. PLoS ONE. 2014; 9(6):e99266.      [DOI]      [File] 

Karlen, Walter, editors. Mobile Point-of-Care Monitors and Diagnostic Device Design. Boca Raton: CRC Press; 2014.     [File] 

Garde A, Karlen W, Dehkordi P, Ansermino JM, Dumont GA. Oxygen saturation resolution influences regularity measurements. In: Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). Chicago: IEEE Engineering in Medicine and Biology Society; 2014. p. 2257--60.      [DOI]      [File] 

Karlen W, Garde A, Myers D, Scheffer C, Ansermino JM, Dumont GA. Respiratory Rate Assessment from Photoplethysmographic Imaging. In: Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). Chicago,IL,USA: IEEE Engineering in Medicine and Biology Society; 2014. p. 5397--400.

Karlen W, Dumont GA, Scheffer C. Sharing Vital Signs between mobile phone applications. In: Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). 2014. p. 3646--9.      [DOI]      [File] 

Dehkordi P, Garde A, Karlen W, Wensley D, Ansermino JM, Dumont GA. Sleep Stage Classification in Children Using Photoplethysmogram Pulse Rate Variability. In: Computing in Cardiology (CinC). 2014. p. 297--300.

Dunsmuir D, Karlen W, Gan H, Chiu M, Petersen CL, Dumont GA, Ansermino JM. The design of a respiratory rate mobile application. In: International Anesthesia Research Society Annual Meeting. 2014.

Crede S, Merwe G, Hutchinson J, Woods D, Karlen W, Lawn J. Where do pulse oximeter probes break?. Journal of clinical monitoring and computing. 2014; 28(3):309--14.      [DOI]      [File] 

Garde A, Karlen W, Dehkordi P, Wensley D, Ansermino JM, Dumont GA. Analysis of Oxygen Saturation in Children with Obstructive Sleep Apnea Using the Phone-Oximeter. In: Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). Osaka: 2013. p. 2531--4.

Karlen W, Ansermino JM, Dumont GA, Scheffer C. Detection of the optimal region of interest for camera oximetry. In: Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). Osaka: 2013. p. 2263--6.      [DOI]      [File] 

Garde A, Karlen W, Dehkordi P, Ansermino JM, Dumont GA. Empirical mode decomposition for respiratory and heart rate estimation from the photoplethysmogram. In: Murray, Alan, editors. Computing in Cardiology (CinC). Zaragoza: IEEE; 2013. p. 799--802.     [File] 

Karlen W. Empowering Home-Based Carers with Medical Applications on Mobile Phones in the Western Cape. In: Sustainable Rural Health Research Day. Worcester, South Africa: 2013.

Karlen W, Ettinger KM. Ethics Consultation In Mobile Health Application Design. In: Abstracts of the Global Health & Innovation Conference. Yale, USA: Unite for Sight; 2013.

Brouse CJ, Karlen W, Dumont GA, Myers D, Cooke E, Stinson J, Lim J, Ansermino JM. Monitoring nociception during general anesthesia with cardiorespiratory coherence. Journal of clinical monitoring and computing. 2013; 27(5):551--60.      [DOI]      [File] 

Karlen W, Raman S, Ansermino JM, Dumont GA. Multiparameter respiratory rate estimation from the photoplethysmogram. IEEE Transactions on Biomedical Engineering. 2013; 60(7):1946--53.      [DOI]      [File] 

Karlen W, Petersen C, Gow J, Ansermino JM, Dumont GA. Photoplethysmogram Processing Using An Adaptive Single Frequency Phase Vocoder Algorithm. In: Fred, A and Filipe, J and Gamboa, H, editors. BIOSTEC 2011, CCIS 273. Berlin Heidelberg: Springer-Verlag; 2013. p. 31--42.      [DOI]      [File] 

Karlen W. Pulse Oximeters on Mobile Phones for Rural Health Care. In: Sustainable Rural Health Research Day. Worcester, South Africa: 2013.

Dehkordi P, Garde A, Karlen W, Wensley D, Ansermino JM, Dumont GA. Pulse rate variability compared with heart rate variability in children with and without sleep disordered breathing. In: Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). 2013. p. 6563--6.

Dehkordi P, Garde A, Karlen W, Wensley D, Ansermino JM, Dumont GA. Pulse Rate Variability in Children with Disordered Breathing During Different Sleep Stages. In: Computing in Cardiology (CinC). Zaragoza: IEEE; 2013. p. 1015 -- 8.     [File] 

Karlen W, Lim J, Ansermino JM, Dumont GA, Scheffer C. Recognition of correct finger placement for photoplethysmographic imaging. In: Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). Osaka: 2013. p. 7480--3.      [DOI]      [File] 

Chiu M, Karlen W, Dunsmuir D, Görges M, Gan H, Lim J, Ansermino JM. The RRate Mobile App; Developing a robust measure of respiratory rate for use in low-resource settings. In: Child and Family Research Institute Summer Student Research Day. Vancouver, CA: 2013.

Raman S, Brouse CJ, Karlen W, Dumont GA, Ansermino JM. A Data Fusion Approach for RR estimation from PPG (STA Engineering Challenge). In: Proceedings of the 2012 Society for Technology in Anesthesia Annual Meeting. West Palm Beach: 2012.

Karlen W, Ansermino JM, Dumont G. Adaptive pulse segmentation and artifact detection in photoplethysmography for mobile applications. In: 2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society. San Diego: IEEE; 2012. p. 3131--3134.      [DOI]      [File] 

Karlen W, Lim J, Ansermino JM, Dumont GA, Scheffer C. Design challenges for camera oximetry on a mobile phone. In: Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). 2012. p. 2448--51.      [DOI]      [File] 

Brouse CJ, Karlen W, Myers D, Cooke E, Stinson J, Lim J, Ansermino JM. Measuring Adequacy of Analgesia with Cardiorespiratory Coherence. In: Abstracts of the 2012 Annual Meeting of the Society for Technology in Anesthesia (STA). West Palm Beach: Anesthesia and analgesia; 2012. p. S8.      [DOI]      [File]