function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Akrami, Mohammad Ali', 1],
    ['Akrami, Mohammad Ali & Shahedi, Alireza', 1],
    ['Ebrahimi, Forough & A, Mohammad', 1],
    ['Ermilov, Sergey G. & Rybalov, L. B.', 1],
    ['Gomez-PamiesK, Diego Fernando & MartinezK, Pablo Antonio', 1],
    ['Hugo-Coetzee, Elizabeth A.', 9],
    ['Murvanidze, Maka & Cilbircioğlu, Cihan & Özdemir, Esengül', 1],
    ['Murvanidze, Maka & Mumladze, Levan', 2],
    ['Norton, Roy A. & Ermilov, Sergey G.', 1],
    ['Seniczak, Stanisław & Ayyıldız, Nusret & Seniczak, Anna', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=19)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);