function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bednár, Radovan & Červenka, Ján & Arendt, Darina', 1],
    ['Greeshma Ganga, K. G. & Manimohan, Patinjareveettil', 2],
    ['Karunarathna, Samantha C. & Priyashantha, K Hasith', 4],
    ['Rao, Gu & Dai, Dan & Zhao, Hui-Nan & Liang, Yi & Li, Yu', 2],
    ['Schünemann, Bárbara Letícia Botura & Westphalen, Mauro', 5],
    ['Zambrano-Forero, Cristian J & Davila-Giraldo, Lina R', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=15)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);