function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Gu, J. X. & Dai, L. & Huang, J. H.', 1],
    ['He, Zhixin & Zhang, Tao & Ma, Libin', 8],
    ['Kim, Tae-Woo & Puskás, Gellért', 2],
    ['Sakenin, H. & Samin, N. & Imani, S. & Rastegari, J.', 1],
    ['Sergeev, M. G. & Storozhenko, S. Yu. & Benediktov, A. A.', 1],
    ['Storozhenko, S. Yu. & Paik, J. Ch.', 1],
    ['Yang, C. & Wei, Z. - D. & Liu, T. & Liu, H. - Y.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=15)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);